Top 5 Subaru WRX Blow Off Valves

Aside from the increased performance, one of the best parts about driving boosted cars are the sounds that come from under the hood! Today we’re talking about Blow Off Valves. Not just any blow off valves, we’re comparing the best BOVs for your 2015+ WRX. We’ll be comparing different sounds, looks, and price points! So get settled in and get ready to fall in love with a new BOV for your Subie!
Get your favorite BOV here:
HKS Super SQV4 BOV: bit.ly/2TO6Dc1
TMS Respons Adjustable BOV: bit.ly/33fizq0
Perrin Recirculating Blow Off Valve: bit.ly/2TLjMlT
Cobb LF Bypass Valve: bit.ly/2vgS8DX
Turbosmart Dual Port Blow Off Valve: bit.ly/39RWKja
Subscribe to our KZbin channel: / @maperformance
Follow us on Instagram: / maperformance
Facebook: / modernautomotiveperfor...
Blog Post: www.maperformance.com/blogs/m...
Content Credit:
• subaru wrx sti turbo s... (Himynameis Mark)
• HKS SUPER SQV4 BLOW OF... (ELASUBI17 SAN DIEGO)
• hks super sqv (sequent... (japanesecarcm)
• 2019 Subaru WRX Series... (ABMMattStacks)
• 2015 WRX HKS SSQV4 Ful... (WRX Channel)
• HKS SSQV full recircul... (bpm03)
• Subaru Wrx GFB Bov In... (SimpleCarTips)
• 2008-2014 Subaru WRX -... (Lowminati)
• THE SUBARU SOUNDS SO M... (Daevin Wlodek)
• Perrin Cold Air Intake... (F PS)
• Parts Install: Cobb XL... (HawkeyeSTiGuy)
• Video (KleenSTI)
• Subaru WRX Acceleratio... (SmurfinWRX)
• HOW TO install a dual ... (Salvo Brothers)
• Subaru WRX Dualport BO... (Anthony Guardanapo III )
• 2015 Subaru WRX turbos... (Crafted Ambitions)

[@geetarinmofo]

Just want to share a little experience with the community. Have a stage 1 MAPerformance with a few extra mods. Bought the TurboXS Hybrid 50/50. Installed it as shipped and couldn't be happier. Love it. My car is currently in the shop getting full Turbo back, TGV, EGR, TMIC and full stage 2 pro tune. Was called today and told the BPV is leaking and is a common problem during this upgrade. Stock BPV is the way to go. If I wanted that sound (because we know it does nothing for performance) then the Cobb BPV was the way to go. I was also told Boomba was garbage.

[@MarcellJjr]

That is crazy I just spoke with Tony about this and will most likely be ordering one tomorrow from them

[@Richdaadie]

I like how at 6:20 they exposed how the turbo smart blow off valve threaded piece will not go with the crank case pressure pipe infront of the intercooler

[@brianmullen6015]

It's all wrong anyways unless you have an sti...thought this vid was for WRX

[@LymaxVisuals]

I’ve got a blue turbosmart adjustable bov set to 50/50 on my 15 STI , flutters and goes pshhh at the same time 🤩

[@YellowMamba8]

Is it nice?

[@JulianaCosta-rr6tm]

,

[@JulianaCosta-rr6tm]

H

[@JulianaCosta-rr6tm]

yfC

[@brianmullen6015]

Because you have an STI not a wrx..

[@mikehoang2276]

Went with perrin got it from import image racing for $165 it was $35 cheaper than ma performance

[@Kudoas]

came to check the sounds but ill be sticking with Bypass Valves to keep my STI happy.

[@omialmanza1900]

I went with boomba and love it!

[@jeffreygordonjr3127]

very smooth talking Charlie Mayne lmao fyi we need one of these for the q50/q60 community

[@balancebreaker1561]

Blow off valve is definitely my favorite sound a car can make

[@Ye-yz7cx]

Suuuuututuutu better

[@rudycorona7367]

@@Ye-yz7cx I like the turbo flutter better but I think that lowers the mileage of your turbo so I’d go with a bov

[@dustinnunley8802]

Definitely gonna get the hks

[@ObiWanStromboli]

For some reason I’ve never really liked the PSHHHHHH sounding ones as much as I’ve liked the flutter sounding ones. With that being said I’d go with the HKS one

[@Ye-yz7cx]

ivebeen fax yo

[@dieselburner4461]

Flutter is for butterflies

[@0_K_0]

The proper flutter is from not having a bov

[@davidmorris1735]

Flutter isn't from the valve...

[@Gsteely777]

I have the boomba blow off valve and it honestly sounds better than all of these. I would go with HKS though

[@xorvious]

This video seems like a good idea, but useless when almost all the examples arent even a 2015+ WRX, some arent even subarus! I would really expect better from MAP

[@dspierre28]

I was thinking the same thing only 15+ Rex and rest are older and he says easy installed lol yeah ok, my blow off valve is under car ain't that easy on 15+wrx

[@maperformance]

Absolutely thanks for pointing that out! Good thing the sound should be pretty much the same on most platforms.

[@georgeboyer6355]

@@maperformance yeah it should but the positions of the bov are in two different locations. there is so much in the way of the fa20dit bov since its all the way in the front on the right and the ej is by the intercooler. so the sound isnt gonna be exactly the same due to not really being able to hear it. why not use idk a 2015+ WRX with these bov when you make a video for 2015+ wrx. Not an STI. just a thought.

[@Greekfreak_subie]

All of these are for STI’s not WRX’s. Clearly those are EJ’s and not our FA’s. The title needs to be changed to STI. IMO

[@TheMyhouse789]

I have a muffle delete with big tips and I have the Perrin bov I cant hear if for shit if I have my windows or up! But if you focus on the “psshhhh” you’ll hear it , not too loud but the throttle is more responsive! From a scale 1-10 I give it a 7.5!

[@kris7500]

would be nice if you tell people that most Subarus aren't designed to run a BOV and in fact you should be using a BPV. Can I also point out there one in the background is stock

[@matt2244]

Should this mod be done on a stock engine?

[@nokz80]

I have had the TurboXS RFL on my 11 WRX. You do have to tune VTA BOV to keep it from running rich...but I feel like it has a much better feel with turbo response without the recirc. Plus the sound is dope AF

[@kyleweller2253]

What tune did you get for your 11’ WRX? I have a 12’ WRX and looking for right tunes

[@julianpeden4688]

@@kyleweller2253 you talk to a local tuner he don’t know

[@blu52791]

I heard it wasn't good to get an after market blow out valve if your car is stock tho how accurate is this

[@SqubaSquid]

The shop that tuned my car to make 350whp on e85 with the stock recirc, was against gfb bovs or recircs. They did not like it. I had a buddy that bought a 2008 STI with an IAG stage 1 short block that failed withing 10k miles. It also was running a GFB BOV.... Now that might not be the reason for his failure BUT even the shop was surprised that the IAG motor failed so quickly.

[@officialdjhoody]

Do you have to tighten the nut on the top for the vacuum line or is it supposed to still turn once installed?

[@saigoneze4465]

I have the Gfb response bov and it's great .Set to 90/10 recirc it's the best of both worlds

[@sixstrz8310]

What setting would be a higher pitch noise rather then a whoosh noise

[@enriqueesparza3858]

1:08 that single stuu blow off sound. The hks sounds a little different between drivers. Can you adjust it to make it sound different?

[@geolyntonjodius8213]

can you make performance videos of a nissan r34 or evo3

[@errorerror3771]

Which blow off valve is used at 0:37 ?

[@AidenArchuleta-dq6tu]

would i need a tune to run a bov or bpv? is it really worth it? i’m a sucker for turbo noises and also new to the car community 😅

[@Luca-sti]

I want to know what makes the rally cars do that chirping noise its not stustu more like chirp chirp. Is that also from a blowoff valve ?

[@samuelochoa7232]

Can y’all do one for the evo X!

[@ProjectBenjamin]

Those are STI vids 🤔, they dont have same bov/bpv as the FA

[@cloudyy4148]

So question is… would I have to tune the car in order to order any of these ?

[@MarcellJjr]

For STI do you want to recirculation valve not a blow off valve

[@christopherdherman1518]

I want all of them.

[@xechorevived5926]

do they have to be tuned to put a bov in?

[@K03sport]

Noises are great, but I'm for what works best in my (recirculation/closed) FA20 system...sure, dual is OK, but I don't want to run too rich. I'm looking for a fast responding, tunable, serviceable/rebuildable recirculation (Bov) valve. I haven't seen many tunable/serviceable recirc valves for the fa20; let alone the kits to add different springs. Any suggestions?

[@AblationMusic]

Yeah go Speed Density, then you won’t have to worry.

[@KrGsMrNKusinagi0]

having vented HKS SSQVs forever it only runs basically a little rich between shifts.. Never had any issues other than that with my AFRS when i check.. HKS has a recirc kit included so no worries if you want that and it works under low and high boost no springs required

[@jorgea279]

Is a tune or anything else necessary with these?

[@jasperhazel4173]

Can this work in the Subaru Forester?

[@keiohbunch5983]

can these work for my audi s7 2015?

[@chouvue5030]

How does it sound on an automatic transmission?

[@PabloHernandez-tt9wc]

Tms respons has my pick

[@davidcee1616]

Why does the hks have flutter in some clips and none in others ?

[@whosnahi8965]

Do all of these require a tune?

[@davidyoung7858]

I just bought a 16 wrx premium, new to all of this. What would be the best bov for a daily driver that doesn’t want to worry about causing and long term problems to the engine. But, wants a good sound ( I want to hear the turbo ) thanks guys!

[@maperformance]

All of these options are reliable! Just go with the one you think sounds best!

[@adamburroughs3241]

Will the sqv4 fit a 2018 sti?

[@Bruce-le2hv]

I got a HKS Super SQV4 BOV but it doesn't sound like sutututu, instead it sounds like shuuu. Wondering anyone knows what happened?

[@MackWarlock]

Do you need a tune?

[@harrisonreid4263]

I highly recommend looking into the Forge bpv/bov. Extremely unique sound, flutters at low boost & sounds like a cross between the HKS & the GFB when you giver the beans

[@crimzuhn1728]

Do you have one? I can only find 2 vids and I can’t really hear them that well

[@crimzuhn1728]

and do you recommend the atmospheric or recirculating?

[@jakeroeseler2195]

If you're mostly doing it for sound, why not just get an intake and at least get some performance out of it? Plus the turbo system uses a BPV that recirculates air back through the intake from the intercooler to keep the car from running too rich when you let off the throttle. An intake (I run the mishimoto race intake on my 16 STI with no air box since temps don't get that hot where I am) plus an accessport with the Cobb stage 1+ tune (which I run with no problems since the SF intake and mishimoto intake are nearly identical) is cheaper and less time consuming than paying a shop to get you a pro tune, which you really don't need unless you're planning on things for real power like E85, bigger turbo, etc. The intake sound is louder and sounds better IMO, just my 2 cents.

[@d3tach3d]

Which was the one at 0:43?

[@drudawg4981]

I'm between the HKS and the TurboSmart. I like the high pitch pshhh of HKS, and I like the versatility and sound of the turbosmart too. which one should I get????

[@maperformance]

Dru give us a shout! We'd love to help you out.

[@drudawg4981]

MAPerformance I went with the Turbosmart. Where are you guys located?

[@maperformance]

@@drudawg4981 Good choice for sure! We are in Cottage Grove, Minnesota.

[@drudawg4981]

MAPerformance that’s a little far from Oregon where I’m at lol. I appreciate the reply! Have a good one!

[@shdymoj0]

Can you guys do a list for the Evo X?

[@maperformance]

Quite possibly! Stay tuned, this could be a possibility sooner than you think 😉

[@ifunny2725]

I want something in between the STUTUTUTU and the PSHHHHH honestly

[@edpertimos5329]

all of this needs to be tune or not??

[@stupidslave]

I like the stutter sound but blow off valves will help the turbo last longer

[@fordifly1368]

Who told you that? lol

[@stupidslave]

@@fordifly1368 flutter is air going back toward the turbine which is basically backpressure at the turbo

[@fordifly1368]

@@stupidslave a blow off valve is completely useless and a poor choice for this platform. Period. Upgrading the oem bypass valve however might be a good idea depending on what other mods you have and how much power your car is making.

[@2018wrxaddict]

Turbosmart 👍👍👍

[@jasonmacneil2256]

But you shouldn't put one of these cool blow off valves on a stock wrx sti right??

[@MrAtrembla]

Hi subie lovers. I’m a newbie with subie, and all this stuff is very interesting. Does a BOV require any mods for the MAF sensor? Does it require a tune from say an Access port? I’ve had conflicting reports and I’m not totally sold on getting one. This is also because I’m not a turbo expert etc. thanks for your videos, I find them very pleasing to my ears.

[@Tonkasgarage]

Any mods you should run a tune. Even a simple exhaust I would run a tune. The access port would do just fine. No you don't need to change the maf sensor. It's plug and play

[@krisgrafili6780]

@@Tonkasgarage Why should I get a tune if I add parts?

[@GundyrX]

@@krisgrafili6780 Anything post MAF(metered air that your ECU is expecting for combustion) that will exit at some point before entering your engine needs to be accounted for. aftermarket Downpipes flow more exhaust gases than stock, Intakes draw more air than what is expected by the ECU on the stock tune. If the ECU is trying to use the same amount of fuel for a now increased amount of air entering the engine, this causes you to run lean(too much air) rather than rich(too much fuel, not enough air).This will create knock events and eventually grenade your motor.

[@Arminzzgg]

Are these legal in CA?

[@jackw4699]

need a top 5 wastegate video

[@andrewp-crichton6151]

Hi, how do you get the air flutter sound on the ssqv4? Is that with the recirculating kit? Cheers

[@bakersavage229]

Tbh that’s compressor surge and you absolutely do not want that

[@ilypurp13]

@@bakersavage229 but it just sounds SOOO good

[@keenanborgford8224]

What’s the one at 00:42 seconds ?

[@dnawrapsatl]

Im pretty sure the fa20 dit motor uses a bypass valve not a blowoff valve. You can use a boomba bpv without a tune but to run a blow of valve that vents to atmosphere would require a pro tune. Imho I dont think it's worth running ANY BOV. I done see it adding much power if any. More likely to LOSE power. The best bpv is boomba hands down.

[@xDynames]

The FA20 does use a bpv, however adjustable ones like the gfb which comes in 100% bypass or fully adjustable are also able to be used. Boomba may be the most popular, but most tuners dont recommend it.

[@2Guys1ControllerShow]

Link for the boomba? Plz

[@annhylton1976]

new when it comes to mods can you put a blow off valve in a stock sti

[@Z750Monster]

You sure can!

[@kidscope886]

Doesn’t the FA20 engine need a BPV to keep reliability

[@devinlarkin4500]

Kidscope I was wondering the exact same thing! I’m about to order one and now I’m confused! Either way I’m going to play it safe and go with a bpv

[@omialmanza1900]

Same?? Here.

[@ericferlenda8955]

Yes, a fully recirculating bypass valve is needed. This video was made by someone who doesnt know what they’re talking about.

[@saigoneze4465]

i use the gfb bov it's perfectly fine as you can set to 90/10 recirc so still doing the bypass and get the flutter sound

[@TheHanz117]

THANK YOU!!! Someone who knows a little some thing. BOVs are never a good idea on a vehicle using a MAF. They cause all kinds of problems with fuel trim.

[@cre8tivegarage157]

Another great video 👌

[@rahmy9616]

Can i put the turbosmart dual port bov on 2013 wrx? Last one it says 2015+ i like that sound or it wont fit to 2013 plz let me know

[@GokantheHusky]

Im pretty sure you can if your engine is a 2.0L Flat 4 Turbo

[@taimomatau9606]

Can you you have like half flutter half pssssssh sound ?

[@undergroundlegend198]

Up your game

[@zietbukuel]

Will any of these work on a CVT?

[@stevenward8504]

Wondering the exact same thing. Any updates ?

[@hunter20011]

Is the HKS BOV flutter louder with the MAperformance STi Intake?

[@Z750Monster]

The BOV volume won't change with a different intake. Will be slightly louder/more aggressive sounding with more boost pressure though.

[@jusplatinumz]

HKS FOR THE WIN ALWAYS

[@alial5027]

I’m confused! I see a Mazda in one of the videos while the rest are STI’s. Are all these cars called WRX nowadays? 🤔 @maperformance

[@S1KRROD]

Lmao thank god I wasnt the only one.

[@maperformance]

Absolutely thanks for pointing that out! Good thing the sound should be pretty much the same on most platforms.

[@johnlund6884]

Lmfao I was geeking when I saw the Mazda

[@chouvue5030]

Will it ruin my warranty?

[@joezeigler]

do I need to tune my car after installing?

[@limitless4598]

You do not NEED to but it might run better and more efficiently with a tune, but if you buy one made for your vehicle. More than likely the default settings will be runnable👍 and some come with adjustable dials and some are preset how they are made to be as well

[@kmsti8677]

I didn't know 15+ wrx have a EJ25's too.

[@yumin_tv]

they don’t, they’re all FA’s

[@dam1219]

i just ordered the GFB but very concerned, i see it’s safe but unsafe to run on a untuned wrx, can people please clarify this for me

[@maperformance]

You should have no problems running it on a stock WRX!

[@edwinlasalle3115]

Do you have to tune the car to install one of these??

[@kennin_salas4485]

Nopeee

[@hunter12164]

On stis yes on wrxs no

[@mkm7962]

I own the 2015 wrx sti with the 2019 type uk ej257 short motor, i installed an HKS SSQV4 bov and it caused the car to run rich popping on throttle back off and all that wonderful stuff. Got recommended by the technician who fitted my new motor to map in any changes like bov valves from recircs' as it changes air to fuel ratios. Also if removing stock air box for k&n or similar cone type filter. something to do with the way the boxer engine injects its fuel in the inlet manifold and not direct injection. fa20 motor in 2021 motor apparently doesn't have this issue. this is just my experience and what i have been told by Subaru, could be different for you or your region. hope this sheds some light on your question. :)

[@CAAK-hd6uh]

Could I Put This On My Fully Stock 2019 WRX Without Damaging Something?

[@Acrimoniousbear1]

It will run rich if u get anything that doesn't recirculate. Otherwise there is no need to tune for a Bypass valve.

[@neuspeed79]

You’re gonna need a tune if you’re gonna put in a blow off valve. Also, if this is your only mod, you would get 0 hp gain from it. Probably even lose some power because air is vented instead of recirculated.

[@Z750Monster]

I would disagree - don't need to tune if you install a BOV. Won't run rich as the a/f ratio is only affected when the throttle is closed, no fuel being injected then anyway.

[@ontariocb5770]

Hey man been watching your vlogs just wondering if you can help me, i got a 2013 wrx and got stage 2 tune running catted downpipe turbo back and stock airbox so recently i put 94 gas in it and starts giving me shitty reading on my accessport and started losing power and no pull so i took all the gas off the car and but a clean gas and injectors cleaner but still runs poor any advice what should i check or look at it?

[@justagame4939]

Charles Reyes is the car tuned for 94? And what other mods have you done to make your car a stage 2?

[@ontariocb5770]

JustaGame its on the comment, found the problem just needed to replace all 4 coil packs

[@justagame4939]

Charles Reyes awesome man, I was going to say maybe get a intake for the car since it’s in stage two, I would stay at stage one if all you have done to the car turbo back and a down pipe.

[@davidcohen2762]

@@ontariocb5770 you wasted your money, i have the same gen car and it says under the octane notes that when using 94 the 91 tune should be selected. 94 is 100% gas when 93 is about 85 gas 15 ethanol. The car can't make as much power with that setup

[@vespernightsky1169]

If you put a high flow downpipe on the car you are required to run a stage 2 map, however you can run lower octane stage 2 maps. I have pretty much the same thing going on as OP

[@john.r4401]

What about just wrx not sti

[@aaronsempa5820]

How bout us still driving older subarus?

[@rxNova]

i know bro, i dont like the look of these new subies and im starting a GC8 project. everyone be about these 15+

[@ZephyrusRomerG]

VA sucks

[@CheifSmokinDank]

Bugeye here and I want to know what one gives the best sound?

[@boisetkai]

Can you install a after market BOV like the HKS on a stock STI? Will a tune be needed?

[@Z750Monster]

Yes you can, no tune required.

[@danielserrato7907]

Do these bov work for 2014 Subbies too?

[@maperformance]

Most of these are for 2015+ but will have other versions that will fit your year, give us a shout we'd love to help you find something.

[@danielserrato7907]

MAPerformance a shoutout on what? Any social media? You guys are definitely helpful💪🏽

[@swrt03]

Alright you guys

[@leland5519]

Anyone here running the GFB bov without tuning? I know on their site they say a tune isn't required but just wondering if there's anyone having problems due to not pro tuning with it. Thanks in advance.

[@CanadianGamer1428]

i am running on a cobb tune

[@zombieslayer658]

I run a gfb and have no issuses at all and mine vents quiet a bit sounds good and i dont notice any power loss

[@leland5519]

@@zombieslayer658 sweet. thanks for letting me know. I had one of these on a forester xt (installed before I bought it) and recently upgraded to an sti. really want that sound back lol

[@DETCOR]

@@leland5519 if you have it too open it makes the car studder and stall , but overall its not like a must have tune it makes the computer freak out too lol

[@willypete845]

I blew my GFB BOV to pieces on a 15 FA20. Sounded beautiful when it was alive and functional. I learned the hard way that the FA20 prefers BPV.. this video needs a disclaimer in maybe fine print stating “you may stall at every stop light/sign and or idle like a cammed out LS1 at the Friday night drag strip” and another one stating “BOV - Speed Density, BPV - Happy Tuner”

[@benjaminfulmer9181]

Funny how many people think compressor surge is desirable

[@ZephyrusRomerG]

Greddy ❤️

[@val818ley]

What BOV does Dustin Williams have in his r35

[@Zaratium]

how would i go about getting that turbo flutter?

[@jairoaguilar3838]

Buying the HKS bov

[@DriftNick]

Run no bypass valve or blow off valve.

[@Jabbazuki]

I'm so confused... I thought BOV were bad for WRX, and you should get a bypass valve instead?

[@brianmullen6015]

That's why the vi was for STIs if uou looked at the top mount BOVs

[@philedwards3336]

Can you write a tune or do you gotta dyno tune it when you install a bov?

[@joshuac2391]

probably just an e tune or pro tune it should run you like 200-400$

[@icebreaka1969]

I still like the HKS SSQV more.

[@oz88og40]

Hks bov is my favorite

[@tylerjohnson7556]

08 sti and up bov's??

[@fairlifemilk3533]

That's what I was here for

[@S2k_GRsti]

me too, say you guys know if you need a tune to run these?

[@jackstrong9483]

@@S2k_GRsti you don't need a tune technically I didn't have one for a while while i was waiting for other parts and didn't notice anything

[@mrayhanfhasya9585]

0:38 what blow off

[@ogbobbyjohnsona4685]

Top 5 ecoboost mustang exhaust

[@fairlifemilk3533]

Go to CJ's pony parts for that bruh

[@paulhadnot1173]

Very misleading video based on title and thumbnail. Especially all the in accurate examples given.

[@donmerrigan2362]

The video was about price and how they sound. That isn't going to change on a different car.

[@kaizokureeves]

Nice video! Thanks for making this without wearing an oversized kids hoodie with a giant shoe string going through the collar with a lady v-neck tie up thing...hahahahahaa

[@joshtully7352]

TurboSmart is best

[@rapter3948]

Can't even hear the cobb one

[@LAXEAZYE10]

No boomba?

[@maperformance]

Also a good option we have available on our site!

[@kennin_salas4485]

What is the best tune for a wrx 2020? Wanna be at around 500 hp

[@mrdgk211]

Kennin_salas I’m pretty sure you’ll need more than just a tune for 500hp