2020 STI Stage 1 Power Upgrade! GrimmSpeed Subaru Shop Car EP.2

We're back at it with the second episode of The GrimmSpeed 2020 Shop STI Build. Follow @thenotorious_a_r_t as he goes step-by-step adding a bunch of engine dress-up parts and The GrimmSpeed Stage 1 Performance Package! Be sure to subscribe to our page, like this video and hang on for much more to come! Visit the links below to pick up any of the parts you see in the video:
Stage 1 Power Package: www.grimmspeed...
15+ WRX/STI Fender Shrouds - www.grimmspeed...
Radiator Shroud - Subaru 15-20 WRX/STI - www.grimmspeed...
Alternator Cover - Subaru 05-09 LGT/04-13 FXT/02-14 WRX/04-20 STI - www.grimmspeed...
Lightweight Battery Tiedown - www.grimmspeed...
Bolt Oil Cap - www.grimmspeed...

[@Ryang405]

“Let’s swap in our new light weight battery tie down” “Now, let’s throw on the oil cap replacement. Getting rid of this cheap plastic (but light) and replacing with this (heavier) metal bolt”... Whaaaaaa

[@pjhill1741]

Thanks for these shop project videos! I got my 2020 sti in November 2019 And have kept it mostly stock aside from a catback. These videos really help me pick out the next parts I want to purchase

[@GrimmSpeed]

That's great to hear PJ, our pleasure! There are a lot of "widebody, 500+HP" build videos out there, but it's also nice to put out content that our typical customers can related to and get some modding direction from!

[@ArtemBuiltRacing]

Making stage 1 for sti on parking lot, epic! Awesome content thanks!

[@GrimmSpeed]

Thank YOU for tuning in, plenty more to come!

[@BradlehDadleh]

Can't wait for the downpipe! subbed!

[@PomelloRBLX]

Looking to buy an STI by the end of the year and these videos really give me good insight. Awesome work!

[@GrimmSpeed]

Thats great to hear. Glad we can help! Let us know if you have any further questions. We would love to be the deciding factor for you joining the Subaru community!

[@PomelloRBLX]

@@GrimmSpeed Thanks, do you guys know about the reliability of the car with these mods? I don't drive like a maniac like a majority of STI owners but I don't want it to break on me even with normal driving or the occasional pulls. From what I've seen some people pretty much say that the power you guys got on the Stage 3 video is pretty much the max before reliability goes down.

[@Kiss__Kiss]

Those red fender shrouds, although personal preference, make the engine bay look VERY MOPAR-ish.. The rest looked good.

[@GrimmSpeed]

A lot of people have started playing with mixing and matching red/black and we're seeing black fender shrouds with red alt covers/rad shrouds more and more for a sleeker look.

[@jdm4087]

Are there plans to do the same thing for the 2015+ WRX? I know the installation is mostly similar, but it'll be educational to see the differences between the WRX and STi due to different engines.

[@GrimmSpeed]

Really the only thing keeping us from doing something similar to our shop WRX is time, we're so busy with manufacturing that it's hard to pull away and do multiple video series filming at the same time. It's not out of the realm of possibility however, especially if the STI series does well!

[@franciscosalgado333]

This was my question to

[@flat_life750]

it would be sweet if you would have some headers for the GD subies.

[@GrimmSpeed]

If there is enough demand for it, we'd consider it.

[@crashburn1660]

What was the power and torque difference from the drop in filter vs the intake? Great video 👍🏽

[@GrimmSpeed]

Thank you! The filter gained us about 6WHP, 9TQ without tuning and the intake/EBCS/tuning netted another 19WHP and 50TQ over that. Air filter stats: www.grimmspeed.com/grimmspeed-dry-con-air-filters/

[@cridler14]

What are the lengths of the bolts/spacers for the alternator cover? I picked one up second hand but it didn't come with the hardware and I can't seem to get a straight answer anywhere.

[@Flatbushfonz]

You gonna do the cylinder four cooling mod?

[@GrimmSpeed]

It's not out of the realm of possibility, but I don't believe it's at the top of our list at the moment.

[@mcwendel8066]

Is a newer STI just that much better than the older generations? I feel like they’ve had about 300 hp since mid 2000s. I had a 2008 STI that I had a stage 2 tune on and on a Dyno dynamics Dyno it only made 290 whp and 310 tq. Wasn’t sure if the dynos were that far off or if the new generations are just significantly better?! Great videos makes me want to get another STI

[@joshirwin5708]

Has mask on outside and talking about engine breathing better 😂

[@GrimmSpeed]

😂😂🤣😂🤣

[@bbehzadi413]

Stage 2 and 3 videos please 🙏🏻

[@GrimmSpeed]

Each one coming!

[@jarrodnichols8111]

Really surprised to learn that Subaru is still using MAF in 2020.

[@slimthecatdad]

That's because the motor is from 2004 lol

[@VachOrd]

282hp STOCK ???? Hard to believe sorry.... I have 2019 STI stage 2 and its on conservative tune made 300whp and 328 torque... I have all this plus catted lower section downpipe and echaust.... So your stage 1 made pore WHP and torque than my stage 2 🤔...

[@Reflex8818]

Im with you I have a 2020 STi, and i know for a fact my car doesn’t have 280+whp stock.

[@VachOrd]

@@Reflex8818 Agree .... I m not trying to be dick or smth,it's not possible 282Whp on stock STI or RA.... Might S209 be 282 or liitle more but not regular STI.. And with just a intake and 3 port boost controller hit 300+ whp ..cmon ....

[@vballwise]

Stock it should be around 255whp

[@acevedojonathan01]

He also said 282 with 91 octane, that would be even more hard to believe.

[@VachOrd]

@@acevedojonathan01 👍

[@trentcasey5842]

hey i just got a grimmspeed cold air intake for my 2020 wrx sti and im waiting on my cobb accessport to come but idk what map to do for the intake. I was think stage 1 91 oct but im confused and dont know what map is best for my intake

[@christopheredwards357]

It would be interesting to see the numbers with a custom tune without the intake and 3 port. Probably exactly the same. 3 port is not needed at this level. Intake is more of a noise maker than power gainer. The factory air box on the 15+ sti is actually very good and all that is needed is a good aftermarket filter. Here in the uk the factory air box is good upto 400hp (engine hp), before a 3inch intake is needed. All due respect, but this video looks like a marketing video for items that just aren't needed stage 1 level. Stage 1 = custom tune with filter Stage 2 = turbo back exhaust, filter, cold plugs (advisable) and custom tune Stage 3 = turbo back exhaust, filter, injectors, 3 port, fuel pressure regulator, plugs and custom tune. Stage 4 = all of stage 3, forged build, upgraded turbo and fuel pump. Stage 5 = all of stage 4, headers/uppipe and front mount

[@GrimmSpeed]

Hey Christopher! You can tune your car up from stock power levels with the factory intake/2-port, but your engine will have to work harder to try and get towards the same point. A well-built aftermarket intake acts at decreasing restriction before the turbo, directly contributing to a performance gain in terms of more boost (Remove 1psi restriction from the filter and you get 1psi at the turbo effectively). If you're using the same boost level as before that same decrease in restriction can lead to quicker spool up, but more often it has cooler charge air temperatures because the turbo now is working less hard. Part of the purpose of the Stage 1 modifications is also to set the car up for the subsequent stages, that way you’re not constantly running into limitations as you’re tuning. As far as the boost controller, the higher you push the boost on your OE 2-port, the less consistency and reliability you will see. These days a good 3-port is recommended to be thrown in during the first tune, making the tuner’s initial job easier (especially if they have preset tables) and setting the car up for realistically any boost level you would ever throw at it. In a sense this is a Marketing video for our products, but it's also a show of what well-made performance products can do to a Subaru and what people can expect to see out of their cars as they take similar modding paths. There are a 1000 ways to build up your STI, this is just an example of one popular configuration. Thanks!

[@jermainejpshepherd2778]

Decent power for only a couple of mods.

[@GrimmSpeed]

It's amazing what some properly-engineered parts and a good tune can do!

[@jermainejpshepherd2778]

@@GrimmSpeed no doubt. I'm looking at quite a few GrimmSpeed products for my WRX build.

[@GrimmSpeed]

@@jermainejpshepherd2778 That's great, your GS support is much appreciated Peter!

[@hiramaragon1903]

Are you running a downpipe and intake at the same time ? If so what is needed to achieve it? Thanks..

[@Wixhain]

My big question - will you provide Staged tune maps or is it recommended by you to just dyno tune each stage?

[@GrimmSpeed]

For the Stage 1+ you will need to dyno tune just as we're doing in the video series. That's the best way to make the most amount of power on your car in the safest way!

[@oli21888]

So 282whp on a car rated a little over 300 at the crank? not sure about that.

[@kiritowow2736]

282 who if AWD and manul should have around 340 at the crank

[@jeff666p]

@@kiritowow2736 seen tuners say that it's whp x 1.3 366.6 bhp

[@jeffreyb.1657]

COBB site also says these are the numbers...the "rating" from Subaru is felt by many to be shall we say very, very conservative.....295 on 93 stock (airbox, etc.) is the number...so at the crank multiply by 1.2....again to be conservative....you get about 350 stock....so a stage II from the 18..... The 19+ is a great, great ej....the best one we get in the US at least. Also seems that good engineers set up cars at 10% under where they can easilly go stock to give a "safety" margin. That is not a rule but seems to be the case across a lot of cars over the years that I have had - turbocharged cars only... It makes sense from a corporate point of view to take the variations out there in perhaps materials and lower the top to make all the products sold the same.....so people don't say "I got a good one" etc....or I got a bad one..... The RA engined cars probably make 350 to the crank stock and could probably make 380 with a top tier tune and some luck of the draw... This is a great video because it shows what a protune stage 1 can do.....most to OTS at stage 1. I find the outcome remarkable. Curiosu on the downpipe. And curious on the need for an AOS now....

[@devo_yahson]

Wait. Thats an fa engine or ej? Cause that thing look like ej

[@GrimmSpeed]

That's an EJ (in all 04-20 STI')', you would see the FA in the 2015+WRX.

[@aquapisces24]

What's the exact weight difference between OEM and GS shrouds?

[@GrimmSpeed]

Not sure on exact weight differences. But our shrouds are made from lightweight aluminum so shouldn't be anything that makes a huge considerable difference.

[@kiritowow2736]

I watch your last video, so the 282 coming from stock is using 91 octane? if stock using 93, I think it can go 290 wheel all stock

[@youmadbro9779]

Yeah some people said that 2019-2020 stis are a little better powerband wise

[@kiritowow2736]

@@youmadbro9779 that is much better，280 whp actually is the number for stage 2 for the previous gen

[@JimMcKeown]

@@youmadbro9779 I have a 2020 with stock intake, invidia catted downpipe, 3" catback, grimmspeed ebcs and I pro tuned and got 290 hp at the wheels and 320 torque. I was limited by fueling, not the intake at that point. Next build will be fuel system/e85 and fmic, hoping for 350 on stock turbo.

[@vballwise]

I got 285whp and 323tq on 91 on my ‘17 STI with their downpipe, ebcs, and tmic. Definitely would have picked up some more power if I had access to 93

[@smudgeyarksha3514]

I know how to make ya lungs breath better, increasing oxygen uptake, greater energy levels, and less chance of immune system knock 😃 Looking at getting a 2020 in april planning on using grimspeed, and process west for my main mods, cant wait

[@GrimmSpeed]

That's awesome, honestly the 2020 is the BEST variant of this generation according to tuners, can't go wrong with picking one up!

[@xil3ntkha0s]

Is the intake CARB certified? Curious because of the whole EPA thing.

[@GrimmSpeed]

We've applied for certification, but it hasn't been approved just yet.

[@shaunpadilla936]

Can you have stage 2 and above without upgrading your fuel system on a 15+ STI? On your stage packages?

[@GrimmSpeed]

Hey Shaun! It really depends on how far your tuner is pushing things, but generally you can get away with a Stage 2 even 3 setup without upgrading injector/fuel pump, however you may run into some fueling limitations on the dyno at the upper end of those mods.

[@shaunpadilla936]

@@GrimmSpeed thx team for this info! Very helpful for my future planes on my STI!

[@GrimmSpeed]

@@shaunpadilla936 Happy to help, reach out if you need any other suggestions!

[@marcelofernandoiii7561]

I have a question how long mostly to wait the product to come from greemspeed? Because my order last December 12, 2020 until now I haven't received yet. How can I order more products from greemspeed if It took a month or long to wait. I really wants to start building like the same at your car because my car black same as you. Waiting for your reply. Tnx

[@GrimmSpeed]

Hey Marcelo! It really depends on what/where you ordered. If it was directly from us, give [e-mail] a shout to see what the hold up is, if you ordered it through a dealer of ours, give them a call. Depending on the part, it may be on back order because of the hugely increased demand this year, or maybe we're waiting on something like a hardware supplier to come through with an order for us. Either way we're getting things out as quickly as possible since we want to see you upgrading your STI as well!

[@marcelofernandoiii7561]

@@GrimmSpeed thank you! This is the site I ordered mine. order #58156 but anyway I will wait or I should upgrade the grimmspeed Intake stage 1 already. I just worry maybe may warranty will void if I do the dynamic. That's the reason I just want the dry con filter and the MAF hose.

[@GrimmSpeed]

@@marcelofernandoiii7561 Thanks Marcelo, I just looked into your order and it does in fact look like we sent it out on 12/12, however when I ran tracking on it USPS still has it marked as in transit, so it might be held up at their facility. I would start by reaching out to your local USPS hub and see if they have any info, if that's a dead end shoot our customer service guys an email. I think the filter/hose is still a great place to start, then upgrade to the intake once you're ready to tune!

[@marcelofernandoiii7561]

@@GrimmSpeed thank you for following up. Yeah it show only 12/12 to 12/14 and after that I don't know what's happened 😅. Thats good advise thanks! I just recently put a axel back muffler delete exhaust and sound so good. I can hear the rumble so loud now 😁. I liked watching your mods on your sti because I do have the same car and color.

[@GrimmSpeed]

@@marcelofernandoiii7561 You're very welcome! Good to hear you're modding your STI already, good choice on both the model and color ;)

[@cruisin4401966]

Does that front radiator shroud play well with a COBB redline CF intake?

[@GrimmSpeed]

It should. Although we haven't tested fitment of other companies products. Judging from pictures, it looks like mounting and layout is relatively the same as OE.

[@cxlviiir5558]

Will installing the post MAF hose affect the factory warrantee?

[@GrimmSpeed]

There is no tuning required for the hose and most dealerships won't care if you've got it installed, but you may want to switch back to OE if you bring it in for warranty work.

[@cbarajas52]

20 HP with fender shrouds weight you added 10 pounds so negative 10 HP

[@GrimmSpeed]

Haha, idk about that, they aren't much heavier than the OE pieces!

[@bgauthier1983]

SRI and 3-port results in 282whp w/stock exhaust?

[@GrimmSpeed]

282WHP was the baseline, we hit 307WHP/339TQ with the Stage 1 Package/tuning.