Hi guys please can anyone suggest what bhp I should be getting from the mods below, the car has done 42,000 miles fully serviced on time and got forged Pistons..

Subaru Impreza STI 2.5 2007.
Decat pipe removing both cats.
Walbro 255 fuel pump
Performance panel filter
turbo blanket
V power petrol
remap by race dymancs
I have had it dynoed but I thought I should be getting a bit more then What it actually got and was just wondering what other scooby owners think I should be getting from the above mods? I will reveal the actual bhp in due course , just wanted to get other views , cheers

 

I guess 351 to 361....but I'm no expert.
Turbo blanket is good for +1bhp.

 

360 ish

 

310-320

 

depends if headgasket and piston survive or not

 

I achieved 334bhp/381lb-ft with almost identical spec. (But mine was VF48 not the 43).

 

360/390 I think

 

What did it make on the dyno then?
I was also disappointed with mine which is running the vf43, it made 350bhp 385 torque It was estimated by the mapper at 360 and 400. But mine is a WRX hatch.
I would imagine you get a bit more out of your STI?

 

The OP didn't mention a any thing about the rest of the exhaust... Which is why I opted for a lower figure...

I had a sports cat and back system fitted along with a fuel pump and mapping and got 343 bhp 360ftlb

 

Where did you take it to get dynoed? There are no good dyno's in MK or Subaru specialists.

 

arn't API down MK way?

 

Guessing from stuff I have read with similar mods I would guess bout 350.

 

350-360 bhp and 380 -400 torque

 

Thanks for the replies, I got exactly 330bhp, I was expecting 350 ish but I suppose it differs from car to car

 

Hi there is a good 4 wheel drive dyno in Milton Keynes called marlin motors but I dont think many people know about it

 

It made 330 bhp on the dyno, the exhaust is totally standard apart from decat pipe

 

My next aim is 380bhp. Am I right in thinking that I get this by upgrading the turbo? Ideally I would like to keep the TMIC and original airbox if possible

 

IMHO I think that's really good considering the exhaust is standard

 

I used to have a big loud exhaust on it but put the original 2.5 inch one back on as its much quieter, so if i has say a 3 inch exhaust on it would it of made much more bhp? i didnt think that it made much difference..

 

I went 3 inch on mine straight away as I always planned on having more power..

Mine is fairly quiet tbh.. It's not as much the size (although obviously it does help) it's more of what's inside the pipes.. Free flowing etc.

You can get 3 inch that are quiet and 2.5 inch that is very loud.. It comes down to price at the end of the day.

So you could fit a 2.5 inch exhaust and still gain more power without increasing the DBs.

 

Ok thanks for the advise, can you advise which exhaust you have?

 

I have a jetex revolution.. I wanted the miltek but was a little louder so opted for the jetex.

 

Ok thanks for the info, if its quite quiet and should allow for more bhp in the future then i might consider that option,

 

Actually i think my decat pipe is a 3 inch that then goes to a 2.5 inch just before it connects to the original exhaust, so i think i may have to go with a 2.5 inch version

 

That seems a little on the low side?

Thinking of doing this also with 2.5 STi, but that figure is only around 15BHP more than mine has with PPP.

 

My old hawk STi made 380bhp 412lb/ft with the same mods but a full 3"inch decat exhaust and a FMIC & K&N cone filter!!

 

That's a good figure, may I ask where you got it remapped?

 

That's a good figure, may I ask where you got it remapped?

 

Mapped by JGM @ Surrey Rolling Road!!