Right decided to get shot of the Legacy tourer and move to a Hawkeye WRX wagon.
I'm used to a 400 BHP Honda S2000 so I need more than 225 BHP
What I don't want is a loud unreliable car that cost me a fortune.
So I need some advice to get ~300 BHP out of it and still keep it as a daily drive.

So far I worked out!:
Cold air feed to standard airbox (not sure on the detail yet)
Panel filter (K&N/Green?) I presume these are cleanable?
Decat up pipe (H&S/classic?)
Decat down pipe (H&S?)
Sport cat (Prodrive/H&S?) I want to pass an MOT
Mild back box not too noisey (not sure which one!)
NGK PFR7B plugs
Walbro 255 fuel pump
JGM/ECUtek remap

Maybe (if I'm feeling brave)
STi TMIC with scope & tray
sti 550 fuel injectors
sti turbo

I'll get on to the handling shortly

 

you have 550 injetors if its the same as a uk

read this link AndyForrestPerformance

 

Still on the learning curve
That's very useful!
So do we know if a turbo back decat will pass an MOT with just the up pipe cat in place?

 

you wont get 300 bhp out of the td05 wrx turbo im speaking from experience with my 07 wrx

 

No, maybe more like 270/280, although a bucketload of torque which should feel great. It should be in the region of 330lb/ft.

You can make good improvements to the handling for next to nothing - rear droplinks and ARB makes a big difference, and don't ignore the brakes. A pad upgrade would be a worthwhile start.

 

Edited.

 

Although the more usual figure for the TD04 is 270-280bhp, 300 bhp has been achieved on more than one occasion with this turbo

 

Indeed.



As Brun has sited, this is very much the exception!

If you don't EXPECT 290-300, then you can't be disappointed.

 

you uppipe has no cat in anyway.

if you want hassle free mot emissions then sportscat downpipe needed..

quiet echausts or quietish but nice noise still - revolution or miltek

the torque is the biggest gain on the standard turbo 340lb and about 280bhp..

Simon

 

Hi Simon how's things?

One quick Q - doesn't the WRX have a cat in the uppipe?

To add to the quiet but decent sounding backboxes - Subaru WR Sport, which is oval, or the Prodrive, which is very similar but round. I've had both, the WR Sport sounds a little fruitier on startup, the prodrive sounds better on full chat (IMHO).

 

Very good thanks.. you?

I don't believe the 2.5 wrx has a cat in the uppipe..

 

It doesnt.

 

Good - car is still running superb!

Didn't know that about the 2.5's - is that why prodrive don't fit a sports cat for the PPP?

 

Great feedback guys thanks very much!
No need to touch the up pipe then!
So am I right in thinking I need decat down pipe and centre sports cat (plus the back box)
Other than Prodrive anyone good for the cat?

I know the STi TMIC upgrade is a good idea on the "blobs" is that also true on the "hawks"?

I'll edit the first post to add a final list.

BTW sold the Legacy today as well!

 

Forgot
Is there any point in cooling the plugs at this level
Are there any effective cold air intakes or is it a waste of money?
Looking forward to parking it next to this!