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Old 11-13-2017, 03:33 PM   #1451
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Anyone who wants 400whp in a street car probably hasn't felt what 300 feels like. 400 is a buttload of power. I am making 350 in my 14' WRX and it is wayyy more than enough
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Old 11-14-2017, 03:58 AM   #1452
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Originally Posted by Stall master View Post
just buy a 335i please. I made a mistake and build my subi tp 540whp... 60k later. I could have had 700whp with 6-10k in a 335i
You say it's a mistake because of how much $$ u spent? Or is it because you feel that 540 is too much for a DD?

I'm in a situation where I have the opportunity to get a new short block and a potentially put together a build for 400-450hp.

Prior to that, spent about 3k on bolt-ons that brought me to about 340hp & 360tq. Car was a lot of fun for sure. But now I'm lead to believe that I have a cracked piston. So currently, I'm canvasing different options... Keep stock block and go forged internals? Or go new short block and more power...?
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Old 11-14-2017, 04:04 PM   #1453
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Location: ny
2004 Sti


Originally Posted by coffinracer View Post
Anyone who wants 400whp in a street car probably hasn't felt what 300 feels like. 400 is a buttload of power. I am making 350 in my 14' WRX and it is wayyy more than enough
Did you find a huge difference between 300 and 350?
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Old 11-14-2017, 06:49 PM   #1454
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Chapter/Region: Tri-State
Location: Cortlandt Manor
2013 Sti

Default Don't do it without built short block

Just from my experience, you need to have the bottom end built if you want a reliable build. These cars just aren't made for high horsepower on a stock longblock. Beware.....
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Old 01-01-2018, 05:46 AM   #1455
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helpful info thanks
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Old 01-24-2018, 04:12 PM   #1456
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2014 WRX 4-door
Charcoal grey


a lot of power= a lot of money
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Old 01-24-2018, 04:17 PM   #1457
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2014 WRX 4-door
Charcoal grey


let me know how it goes.
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Old 01-24-2018, 11:28 PM   #1458
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Location: The Bay
2018 WRX


I blew up at 4hp
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Old 01-25-2018, 07:45 AM   #1459
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Chapter/Region: Tri-State
Location: Suffolk County NY
2015 WRX

Default Power

Had my 15 wrx since new and spent thousands of dollars on bolt ons and tunes.I gained the most power adding a flex fuel kit and having her Pro tuned .I went from 275 hp 285 tq with bolt ons like turbo back exhaust and intake to 340 hp 327 tq with stock internals on e85 . I would say that is the most bang for your buck a 65 hp gain with just using e85 .
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Old 01-30-2018, 09:48 PM   #1460
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Great informations for starters
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Old 02-15-2018, 05:28 PM   #1461
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good information place to direct people who just immediately want to make big power! nice info
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Old 02-18-2018, 04:16 PM   #1462
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I'm glad that this is a big article here. Everyone I know that's just gotten a Subie falls into this stereotype perfectly and I'll definitely direct them to this forum next time I hear one of them talk about getting 400hp
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Old 02-27-2018, 11:42 PM   #1463
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Originally Posted by Defiant Autospeed View Post
I see these posts on a weekly basis. We all do. It always makes me feel really aprehensive (sp?) when I read it. So I just wanted to put this out there for those that are asking this question.

Are you relatively new to the Subaru thing? Have you ever owned a TRUELY high performance import before? Have you ever owned any HIGH powered car before? Do you have fairly deep pockets?

If you say no to any or all of the above, then I beg you, please read on.

Many many times people have come into the Newbie forum and made the statement "My goal is 400whp" and they almost always JUST got the car.

It needs to be said, and anyone wanting 400whp needs to understand that 400whp is a LOT of power, and it takes a LOT to get there, and even more to do it reliably.

What will get you there?
Well, that depends on the dyno and tuner, along with how agressively you tune it. Dynos read differently and what makes 400whp on one dyny will make 450 on another, an 340 on yet others. Do you want 400whp on your local high reading dyno? Or do you want a TRUE 400whp that will make 400whp on almost any dyno out there?

In general you can hit 400whp on pump gas with something like (this is speaking of a 2.5L motor)

FP green turbocharger (this is larger than a 20G, its a 20G with a 49lb wheel)
Intake (GOOD intake, there are a few)
Front mount intercooler
turboback exhaust. Catless prefered for this turbo and power goal. 3" would definately be recommended but 2.5 wouldnt hold it back much if at all.
Headers or P&P manifold and better crossover pipe.
Larger/better up pipe Definately recommended.

Custom tune obviously, and to hit 400whp you will likely need 24+PSI.
If you run alcohol injection you will get there easier and safer at a little lower boost. This setup will not reach 400whp on all dynos, but it will get you there on most.

Or, and this would MUCH more easily hit 400whp, and on many more dynos. I consider this a "true" 400whp setup.

GT30R rotated mount turbo kit
Front mount intercooler
Header to go with whatever up pipe that setup uses, even better if they make a header specifically for their rotated kit.
fuel pump
Intake (this will be part of the rotated kit most likely)
Custom tune obviously.

Alcohol injection, again would allow lower boost/safer tune to hit 400whp, but this setup shouldnt have any problems hitting 400whp on pump gas by itself. Well over 400whp on race gas, I have seen 500whp on this setup with race gas on a semi high reading dyno.

So great, now you have 400whp.
Lets look at what the hidden costs are.

Clutch- Stock wont last long for 95% of people with this much power.
Flywheel- most do a light flywheel when they do a clutch. You may or may not.
Motor mounts are HIGHLY recommended at this point. Thats a lot of TQing around that the motor will be doing. The stock mounts were designed to hold a 300chp/300ctq motor still and keep noise at a reasonable level. If you are putting 400 to the WHEELS you are easily at 475 crank hp. Over 50% past what the stock mounts were made to handle.

Then lets look at the reliability limit of the stock motor.
400whp has been, since 2004 when the 2.5 came out shown itself to be the reliability limit of the stock pistons/rings. The rule of thumb is, upgrade the turbo, plan on a new shortblock. On something like a 20G or larger, at 20+PSI boost, its no longer a matter of IF, but when. There are of course some rare cases where someone makes 400whp for 50k+ miles, but believe me when I say this, that is RARE. Many with a good tune blow up well below 400whp. Best case scenario, pull the motor out and do pistons before you even install your 400whp setup. The crank/rods should be fine at this power level. Even so, doing a set of pistons can be a close to or just over $2000 investment, depending on what pistons and installer you use. Plan on at least $1500 to get some good forged pistons into your motor. Remember you will be paying for a full gasket kit, and with the motor apart a new timing belt and water pump is never a bad idea. Figure in oil and a filter as well. Small cost parts, but it adds up very quickly.

Then lets look at the safety aspect. 400whp is a LOT of power. In the hands of an unexperienced driver, it is quite litterally a deadly amount of power, especially so in an AWD car that can put the power down. 400whp in a RWD car is one thing, stomp on the gas at 40mph and you get massive wheelspin. Do it in an AWD car and you get hard acceleration. Are you experienced enough? The answer is in almost every case, no. Why? Lets use an example.

You are doing 65mph on the highway in a stock STI, or even light mods. You want to pass someone. Most will pass at roughly 85mph to get around that person. So you give it X amount of throttle, you dont look at the speedo because you have done it a million times, and you accelerate to 85mph.
Now lets swap that out for a 400whp car.
You are doing 65mph, you apply the same amount of throttle to do it, you are VERY quickly doing 90mph, you feel how hard it pulls so you back off a bit, but its all relative and even though it doesnt feel like its pulling as hard, its still pulling harder than it was when stock/lightly modded. You are doing well over 100mph by the time you get around that car.
Now someone comes over into your lane forcing you to turn and go around them while braking HARD. This is a delicate move.

Or, you decide you want to do a hard long pull. The kind that we all love, that puts a big dumb grin on our faces from feeling the seat pushing into our backs. You would have previously made it up to maybe 100-110mph.
So you are in the same place, same stretch of road. You do it again. Now you are doing 140 where you would have been doing 100. Go ahead, hit a bump at 140mph, and see how it feels. What was a "whump" at 100mph can quite litterally throw a 140mph vehicle into the air.

Your STI is a high performance vehicle that can handle high speeds and save your butt from a lot of dumb moves, but its not magic. AWD and the yaw sensors and such can only do so much, they arent miracle workers.

And if not for your own safety, think about what happens if you are doing the kinds of speeds you will EASILY hit with this kind of power and you hit another vehicle.

You may say "yeah but I wont do that kind of thing" That is all well and good, but the reality is that the more power you have, the more often you will drive at higher speeds than you did at the lower power level. I dont care who you are, its an almost 100% chance.

So lets review.

Do you REALLY know what this power goal will end up costing you?
Are you prepared to spend that kind of money?
Are you a good enough driver to handle that kind of power?

Have you even driven a 350whp STI?

My advice to those with a stock/lightly modded (like AP stage 2) STI/WRX, would be to take it in smaller steps. Most of the people I have met that wanted 400whp, were scared out of their mind when I took them out in a 330whp subby. Heck my 309whp 2.0Lwrx scared a lot of them.
Do this if you have a "stage 2" car (make sure you have these parts)

Custom tune. A GOOD custom tune. Do research before you pick a tuner. just because they own a shop doesnt make them good.
Full exh.
[email protected]
injectors and pump.

Because that will be as much or more than 90% of people here will ever want or need. If you want more, drive that around for 6 months to get a handle on what the power is like.

if you are bone stock,
Do this.

Full exh
GOOD custom tune

Of course much of this is opinion, however this is opinion coming from 18+ years of driving, 15+ of those in high powered cars, 10 years of import scene and tuning experience and 5 years of Subaru specific tuning/driving and really importantly in this case, Meeting and speaking to people on Nasioc. So I like to think that it holds SOME truth to it at least

Opinion or not, I assure you the message behind it holds true and you should really take it all to heart if 400whp is your true goal.
I think even 350 is enough
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Old 03-15-2018, 01:50 PM   #1464
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Join Date: Mar 2018

If only there were cheap ways to get 400 whp
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Old 03-17-2018, 11:00 AM   #1465
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Join Date: Mar 2018

Nice post 😃
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Old 03-20-2018, 10:26 PM   #1466
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Member#: 458676
Join Date: Nov 2016
Chapter/Region: BAIC
Location: East Bay Area
2017 WRX


You have to pay to play. What do you all think this setup will make? As soon as I mass the parts but money is flowing and I dont care about the cost.

17 wrx
Current mods
Turbo xs j pipe
Nvidia dual n1 cat back
Mishimoto race intake
Turbxs fmic
Torque solution positive shift kit
Torque solution positive power kit
Perrin pitch stop mount and brace
Perrin short throw shifter

Sti drive train swap
Element tuning long block with ported heads
Steamspeed stx71r turbo
Grimmspeed headers
Aqua mist water meth
Cobb flex fuel
Oil accumulator

And other small supporting mods

Currently saving for the long block!
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Old 04-05-2018, 08:39 PM   #1467
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Join Date: Apr 2018
Default 01 2.5rs rebuild

first and foremost that was an incredibly well thought out post. i am new to the subaru world so take it easy on me lol. but this seems like the proper place to ask this question, i just recently purchased an 01 rs and am looking to rebuild the motor myself with my stepfather who has been working on cars for over 30 years im just looking for the best place to find a full rebuild kit i have seen things on ebay and other sites but i dont trust them fully especially with no reviews at all. any advice would be greatly appreciated.
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Old 04-19-2018, 03:11 PM   #1468
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Member#: 484841
Join Date: Apr 2018
Chapter/Region: MAIC
Location: Maryland
2008 WRX STI
Lightning Red


Making 400 is easy, keeping 400 is hard. It all depends on your turbo, fueling and tune. That's a lot of variables. 400+whp is a lot IMHO. Way beyond the driving skills of most folks.
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Old 04-24-2018, 01:34 PM   #1469
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Join Date: Apr 2018
Default Newbie questions

I am helping a friend who owns a 2005 "Saabaru" (Saab badged WRX wagon). He has removed the turbo and would like to replace it with a larger turbo that is essentially (if possible) a bolt on with a minimum of other changes. We have some experience with mods as he helped me install a 65mm turbo and new MAF on my Porsche. We have purchased nothing but a SS downpipe to replace the factory pipe that I bought him for his birthday. We have no knowledge of any vendors, brands, or who to consult with. I would like to find a knowledgeable shop/person to 1)buy from, and 2)provide tech support on just what we will need. BTW, the car is an auto trans. Any help that would point us in the right direction would be appreciated.
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Old Yesterday, 08:50 PM   #1470
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Join Date: Jun 2018

Love how this thread is still relevant in 2018
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