OEM Airbox Mod | 2022-2024 Civic Sport / LX 2.0

OEM intake airbox mod/ resonator blockoff DIY for 11thgen Civic with K20C2 engine (2.0). Get more induction noise without purchasing an aftermarket intake! Plugs available here on Racebuilds: www.racebuilds.com/l/hpomyc/1...

[@NAUS2K]

Due to popular demand, plugs are now available if you are interested! See link in video description!

[@oomomomomomm]

Would you recommend this to a regular 2.0L sport CVT? Would it actually make a difference?

[@Micah-Woods]

Nice to know! May grab some. Would like to go complete aftermarket CAI with a tune in the future though.

[@randomrebuilds]

Such a bizarre design for that lower resonator contraption! I guess Honda wanted to make the Civic as quiet as possible.

[@xJacobDigitalx]

This is like the Honda S2000 LHT airbox mod. Nice to see on something new

[@NAUS2K]

Yes I am quite familiar with that one too! Cheap and effective !

[@Dan-p360]

Always enjoy your videos . Very interesting mod Naus.

[@mattmcdowell1218]

Love all your content on your Civic Sport. I just took delivery yesterday of a Sport MT in LSM due in part to all your videos.

[@cmbiker]

@mattmcdowell1218 If you don't mind my asking, where did you buy your car and did the dealer have much of a markup over MSRP or any additional BS fees?

[@mattmcdowell1218]

@@cmbiker Just now seeing your question. I got it at DPatrick Honda in Evansville, IN. I paid MSRP, no markup except for their usual doc fees and they included all weather mats. I tried to get them to come off MSRP but they wouldn’t budge.

[@cmbiker]

​@@mattmcdowell1218 Thanks. I picked up one in SGP 3 days ago for about $500 under MSRP and got some of their BS fees knocked off, but had to drive 2 hours away to get this deal. BTW, I find the fueling and throttle response at slow speeds in 1st and 2nd to be a bit jerky. Nothing to do with shifting. For example, if I'm decelerating from around 4K to 1K in 2nd gear with my foot completely off the pedal, as the rpms drop to around 1.5K there is some jerkiness. If I'm in 1st and cruising at around 10mph and let off the throttle I also get quite a bit of jerkiness. Have you experienced any of this kind of behavior? I just came from a 2023 WRX which has the best/smoothest fueling I've experienced in any car or motorcycle.

[@mattfleming7320]

Just made the modification. Super easy and what a difference!

[@natas12rm]

I get like a turbine whistle noise when doing a slow creep. I noticed it at the drive through. Also the dash startle to rattle near the infotainment screen. Thanks for your videos.

[@stevenking9357]

Order placed, thanks for making them so reasonable.

[@norbertorosado6016]

Another excellent video! I plan on replacing the stock intake with the PRL HVI after I finish the exterior appearance mods. I’m slowly modding my car by purchasing something every month. It will likely be a year or so before I start modding engine components, but I would definitely be interested in the caps when that time comes. Cheers!

[@kotastrophie]

No need to wait, it’s an easy cheap/free DIY customization. Just need a little ingenuity

[@ChrisCross-ky7cg]

Outstanding as always, man.

[@Chiefin_Dr00]

That PRL High Volume Intake is by far the best mod out for 11th gen Civics js haha

[@benbryceholden1]

Nice video, @naus. I just bought a 2024 2.0L Hatchback Sport CVT in January and love it (same color as yours, got it at an MSRP discount too!)… I would probably do this mod too, if I had a 6-spd, I doubt it would sound great on the CVT.

[@threat1024]

drop in high flow air filter and make the same noise

[@chetanhanda]

Excellent !! awesome !! You have figured out the best way to hear the induction growl without risk of poor filteration from after market concial filters + not getting any heat soak from the engine. I tested the IAT before and after installing K &N and there is quite a lot of heat being absorbed from the engine bay. At < 0 degrees C ambient , the factory ducting was not able to ram enough air keep the IAT at same temp as the outside. - I recorded 10 deg C above ambent @ 80 to 120 KMH - I recorded 30 to 40 deg C above ambent @ idle , temps would climb very rapidly at idle With the factory airbox, the IAT was always = ambient temp within few seconds of the car picking up speed. Honda did a geat job with the Civci factory airbox without the complications. (Complicated for me was Prelude's factory airbox pulliing air from behind the front right fender, with a vacum driven flap which changed the intake resonator lenght dynamically for best air velocity) You have found the perfect balance of indcution growl + getting the coldest air from the outside. I'm going to do same with mine, getting rid of the K &N :-)

[@NAUS2K]

PRL HVI also seals to the factory duct for nothing but cold air from the front grill. And I have a plan to combat the poor filtration of oiled conical air filters. Stay tuned for my next video!

[@chetanhanda]

@@NAUS2K K& N also feeds of the factory duct from the front grill but since there is no airbox like PRL , it pulls a lot of the hot air too. I didn't go for PRL because I thought the HVI airbox would muffle a lot of the sound

[@NAUS2K]

It definitely does muffle the sound a lot, with my testing it’s not much different than the oem modded box in the video, I’ll explain in the upcoming vid!

[@chetanhanda]

@@NAUS2K I was disappointed with the sound of the K&N also .. I was hoping it was not so quiet.. just can't hear anything below 3.5K

[@xJADD]

That's pretty cool i love the intake sound of this car putting aside it isn't that loud...Actually Mine in particular also have a little whistle in it.. i would do this mod but i dont think i will keep this car anyway

[@zerrrep]

For the 2.0 Algo!!!

[@4Leaf36]

Great instructional quality. I don't know anything, so feel free to ignore, but do you think a similar modification would be possible on the turbo model? Or is the intake completely different when there's a turbo?

[@NAUS2K]

The intake is completely different on the naturally aspirated 2.0. I believe PRL makes a resonator delete kit for certain 1.5T models, however I have yet to see anyone modify a 2.0 like this yet

[@singular9]

I did this on my accord 2.0t or at least something similar, and got away not turbo nose. I plugged it with loctite and a piece of plastic Removing the accordion style intake hose and replacing it with something smooth and straight would sound better.

[@cerinawoehrley4199]

Cool bro I got a 21 accord 2.0t I going to do some stuff to it soon but not to much

[@EL3.PHOTOS]

I'd love to be able to purchase those 2 3D printed plugs!!

[@NAUS2K]

Link for plugs now in video description

[@SLOK20C2]

Man, sign me up for the resonator plugs if you would! :) that mod will sound really nice with the 7500 RPM rev limit and 4500 Vtec I’ve got mine at now, and doesn’t cost $350+ like most intakes. The 93 Tune is really nice too, wakes it up quite a bit

[@NAUS2K]

Link for plugs now in video description

[@SLOK20C2]

@@NAUS2Kawesome!

[@Steven-kc7id]

Purchased the caps from you and installed them, it definitely makes it sound like a CAI at around 3-4k rpm. Like you said it isn’t as pronounced however it will make me happy til my warranty is up! Thank you again they fit perfect and shipped very fast, would absolutely recommend you to buy from! I did look at it and was also wondering if it is taking away from the grill that takes in air at the front as the resonator does loop around. Think we are losing some fresh air doing this?

[@NAUS2K]

Thanks for the feedback! Now that it’s warmer out I’ve been driving around with my windows down and it’s so much louder! I’d try to film that but the wind noise would be too much. It quite sure what you mean about the fresh air comment, all the air pulled into the intake is directly from the front grill so it’s about as cold/ fresh as you can get

[@Steven-kc7id]

@@NAUS2Kfrom what I saw the air goes through the vent into the resonator and back up to the filter, might be completely wrong but I was examining it pretty thoroughly, don’t want to take it back off to look at it again 😂

[@joveysvt]

I’d like to purchase the plugs. Appreciate your videos!

[@NAUS2K]

Link for plugs now in video description

[@christianness8983]

I'd be interested in those plugs, but I can't help but wonder if maybe if you have a large enough 3d printer then wouldn't it make more sense to 3d print essentially the stock air box but just with everything blocked off and going straight into the air filter box?

[@NAUS2K]

You would need a pretty massive and $$$ 3d printer to print the whole box in one shot. The amount of time to redesign that and make it functional would cost so much more than just buying the PRL HVI, so that’s what I’ll be testing next!

[@jaymingles]

This is almost exactly what I did, but I just removed the whole resonator box and blocked off the holes underneath. Apparently some of the aftermarket intakes cause power loss in the mid range, so I really wanted to keep the stock one, especially after hearing your idea a few months ago

[@NAUS2K]

Could do that too, the advantage of leaving it there is you can go back to stock in only a couple mins if you need to (bring the car to a dealer etc) plus with it there visually, they would never know it’s not all stock unless they start removing it

[@jaymingles]

Very true, I definitely took the long road on that one. I wish I waited to see what you did, but I was impatient and wanted that extra grunt

[@NAUS2K]

Did you have to take the front bumper off to remove the res box? Or are all the bolts to remove it accessible from the engine bay?

[@jaymingles]

I got it off through the engine bay, but it took some finessing. I had to keep moving it around at different angles as I pulled it up and out because of how oddly shaped it is. I almost considered hacksawing part of it but didn't want to have to order another one to go back to the stock setup. It's definitely doable, but might be less of a pain in the ass if you remove the bumper.

[@jaymingles]

I forgot because I did this a couple months ago, but I also had to remove the skid plate and squeeze my arm through underneath to get at one of the bolts. My arms are kind of small so if yours are even slightly bigger than mine, that might not be an option

[@RobM184]

If the plugs fit a 10th gen, I'd be interested in a set

[@EL3.PHOTOS]

I'd love to see the PRL intake video! I was debating whether I should go with PRL or K&N, Decided to go with K&N just because it was on sale for $299 instead! Lmk what your choice would've been??

[@NAUS2K]

I like the OEM look and design of the PRL personally. Functionally it mates right up with the factory air guide so I’m a fan

[@g-low9812]

Eagerly waiting for your review on the PRL intake. Ive been on the fence about buying it, seems so expensive for what it is.

[@NAUS2K]

Stay tuned! Sorry for the wait, been strapped with time at home lately !

[@aayanmuzumder5410]

do you think you’ll add an aftermarket exhaust?

[@2005ep3si]

I wonder what if you put some holes in the bottom of that resonator instead of plugging it so that air will be able to get pulled in. Would make it like a oem version of the PRL HVI for the 1.5t with the added inlet option

[@NAUS2K]

There would be no point in putting holes in the bottom of the resonator. The front feed is already a cold area inlet right into the box. The restriction is not the existing flowpath, it is most likely the oem air filter element.

[@2005ep3si]

@@NAUS2K Im curious how the front inlet is behind the front bumper on the 2.0L cars? I know 27won showed how the SI has the biggest oem inlet of all the 1.5t cars

[@tweaksauce7349]

Would a modification like this void any warranties? I have no idea what I’m doing 😀

[@kharazmatik6811]

Nice video!! Are these available to purchase? 🤙🏽

[@NAUS2K]

Link for plugs now in video description

[@minnerttrraa]

Im a little confused about this video. From what I understand, the air passage with the factory intake goes through one hole that you plugged and comes back up through the other hole? Wouldnt plugging both holes completely block the air coming in from the front? I'm assuming 100% of the air goes through 1 hole and comes back through the other. I have an '18 K20C2 and wouldnt mind trying something like this on my car.

[@NAUS2K]

No air enters of exits those holes, I may have misspoke when showing them in detail. The back of the intake shows the wrap around flow design. Plugging these two holes does not restrict the main flow path at all, just prevents the sound waves from entering the baffled chamber

[@WZRD_MACHIN3]

Would these fit the 10th gens 2.0l?

[@cmbiker]

Well, my local Honda dealer just informed me that they are finally getting in a 2024 Civic Hatchback Sport Manual 2.0 in Sonic Gray Pearl tomorrow and I have scheduled a test drive. I asked them about markup and they said they had some markup on their cars but wouldn't go into specifics over the phone. I'll find out tomorrow how greedy they really are. 😬

[@NAUS2K]

Best of luck!!!

[@cmbiker]

@@NAUS2K So, I showed up yesterday at my local Honda dealer and the monkeys didn't have the manual available to test drive (still in their warehouse 30 minutes away) so they try to get me to test drive a CVT model. I remind them I called twice before coming to confirm I could test drive the manual and explained to them what's the point of test-driving a CVT if I want to get an idea of how the manual transmission feels. It took every ounce of my strength not to call them a bunch of morons and just walk out. Being that they are the only dealership in proximity with a manual "in stock" I chose to be a gentleman and agree to come back tomorrow when they hopefully will have the car on premisis.

[@msinna6433]

@@cmbiker how’d it turn out? Did you have to pay a markup? Don’t want to have to deal with this since the closest dealership that has the spec I want is 3 hrs away

[@cmbiker]

@@msinna6433 I ended up having to drive about 2 hours away to a dealer that had the car in the spec/color I wanted. There was no explicit markup on the price, but they always try to sneak in dealer and other fees so I was able to haggle them down to what was basically MSRP.

[@doober4404]

Curious if it works on the 23+ HRV. also has the 2.0 and air filter is same part # as civic so I assume airbox is similar

[@NAUS2K]

Probably does, but if was ever driving something with a cvt , I would want it the be quiet as possible.

[@Steven-kc7id]

Just purchased it, what’s the turn around time on getting them out? Thanks again!

[@NAUS2K]

I’ll have em out in a day or two. Tracking will be posted on racebuilds when shipped

[@Steven-kc7id]

Thank you!

[@MidCity29Loonatik]

What's with that flashing light on you4 dashboard? White box under the right side of the digital speed gauge?

[@NAUS2K]

That’s the speed limit sign recognition. The white box shows the speed limit and it flashes when you exceed it. You can configure it to flash when you exceed it by 1, 3 ,5 or 10mph in your vehicle settings

[@MSmithRacing]

I'd be interested in machining these out of aluminum for my own personal car 23 hatch 6mt. Without pulling my own car apart to get the dimensions is there any way I could message you to get them?

[@NAUS2K]

The ID of the hole is 1.52”, OD is 1.64”

[@k24wkevin]

Very nice. I love OEM plus or rather OEM “delete” content.

[@fl2.bluesclues]

tbh I’d leave it how it comes I just did this mod and it didn’t really make a noticeable difference. Very easy to do if you wanted to do it. Doesn’t give you that intake noise everyone wants tho. Just kind of sounds the same.

[@NAUS2K]

It made a big difference on mine, though a aftermarket unit will probably still be louder

[@fl2.bluesclues]

@@NAUS2K honestly it might be your 3d printed plugs for the resonator. I’d be happy to throw them in too test that if u wanted to make me a set. If u have somewhere I can send u a video of what mine sounds like id send u a video to see the difference. I just used regular duck tape to plug it up.

[@kaydubzz]

Could I just tape over the holes? Or would you not recommend??

[@NAUS2K]

You can try it, may affect the rubber gaskets trying to seal over that area though

[@Rob-sy1ed]

If this good for 2.0 A/T?

[@tonyb731]

Does the 1.5T engine have the same concept/design?

[@NAUS2K]

No the intake is completely different , it also won’t have the same affect as that is a turbo engine

[@isaacenis7970]

I would be interested!

[@NAUS2K]

Link for plugs now in video description

[@scottersandman6408]

did you notice any change in fuel economy?

[@NAUS2K]

No this won’t affect fuel economy, but you may find yourself flooring it more to hear it so that will decrease it !

[@natas12rm]

I would be interested into buying plugs.

[@NAUS2K]

Link for plugs now in video description

[@whereswaldo9089]

I dont know about this. It can be doing more harm than good HP wise even the resonator has its purpose in controlling the air into the engine. Considering how good and efficient the stock intake is and can be tuned to get more gains in stock form. Obviously, all speculation until someone does real dynos. But for induction lovers on a budget, this is definitely the way to go.

[@brycemurdock6984]

PRL did a dyno test and it showed it made +8whp and +6wtq, i don’t notice this difference really but it seems slightly more efficient at high rpm and has better throttle response/noise

[@whereswaldo9089]

@brycemurdock6984 with the stock intake right?

[@brycemurdock6984]

@@whereswaldo9089 The high volume prl intake made those gains over stock, i would only suggest getting it really for the noise however. I also got the megan racing exhaust it is surprising high quality, my civic even burples at low speeds even without changing my front/down pipe yet.

[@whereswaldo9089]

@brycemurdock6984 nice nice! Yea I have the prl intake mainly for noise, and I have a vibrant ultra quiet resonator on the axel back.

[@jeffrothegamer]

Does this allow for more airflow??

[@NAUS2K]

No, it does not alter flow

[@beckbarnhardt3637]

So your saying I didn’t need to buy an expensive exhaust to hear my car I could’ve used tape

[@christianness8983]

Could you please share the file so I can 3d print them?

[@NAUS2K]

I don’t have a good way of sharing them

[@Kendogz74]

So no check engine lights either ?

[@NAUS2K]

No, this has no affect on the air flow path

[@JesseHahn-ml9xw]

yes, to plugs....

[@NAUS2K]

Link for plugs now in video description

[@RaidenSwimsBetterThanSnake]

Opinions on Kia Forte GT?

[@richardmezger5682]

The little box underneath that you taped off might be for catching water. If the bottom of the airbox is airtight, then it would need somewhere to go. Its hard to tell exactly how its oriented in the video, if it would be effective at doing that. I have a SI, which has a different looking airbox. So I can't go check it out. But, on the several Hondas I've previously owned, all of which have gutted airboxes, they all had a tiny hole at the bottom to let any sucked in water drop out of the box.

[@NAUS2K]

I have tested this pretty throughly as this thought did cross my mind. I’ve driven in some torrential downpours and when I arrived at my destination, I popped the hood and zero water entered the intake tract. Filter was still bone dry

[@LopSid3d_AZT]

I’m interested

[@NAUS2K]

Link for plugs now in video description!

[@kotastrophie]

Wow!, it took forever to get up to and through third gear.

[@NAUS2K]

Yeah, it’s not a quick car. But it’s fun for what it is

[@kdomster9141]

There is already too much noise from cheesy CVT and torqueless engine why would you need more?