greatgonzo

iTrader: (1)

Hi this is where I'm at!
Subaru warranty runs out in March and I want to do a few mods after that.
I like the look of the sport cat down pipe by Cobra. It replaces both cats with one sport cat (stainless) for £215.00. I think that's real cheap and looks to be good quality. Was then thinking of a remap by Jolly Green Monster,already have a K&n filter and a Prodrive back box, so I was thinking BHP to be around 320!!.
I dont think I will be spending a lot more on engine mods after that till a mate of mine recommended that I get the headers changed befor my remap. I looked on Ebay and found a good looking set for £220 which is in my price range. Was just after a bit of advice, is this the right way forward?????

stevebt

iTrader: (8)

Which turbo are you getting the car mapped on ??

greatgonzo

iTrader: (1)

Standard STI !!!!
Not sure what it would be called

nixxon

THat is real cheap! Why would Hayward and Scott be nearly £600 , I wonder?...

mantazini

iTrader: (25)

Be carefull with those cheap ones,, i had one with flexy thing... wich colapsed after 200 miles.... U need headers only if u going 400+ bhp... Get ported ones instead,, Harvey is the man to contact ,,, you'll do the exchange for about 200 quid, giving your ones to him and he'll give u ported ones with matched and wrapped uppipe.... faster turbo spool etc... Contact Harvey

greatgonzo

iTrader: (1)

Sorry mate who's Harvey??
What are ported headers??

stevebt

iTrader: (8)

This is the one you want, admittedly its more cash but come resale time it will hold more value

Roger Clark Motorsport - RCM Product Detail

greatgonzo

iTrader: (1)

Looks cool just to much money for me
I like the sound of the ported headers, just don't know if its is worth spending to much money on the headers if I can achieve 320 BHP with a sport cat and remap

nixxon

Stop worrying about numbers, and think about how you want it to drive!

mantazini

iTrader: (25)

https://www.scoobynet.com/dealer-thi...s-up-pipe.html

greatgonzo

iTrader: (1)

I'm not worried about BHP numbers, I'm worried about money
With replacing both the cats with one sports cat and remap seams to me the best value for money mod, and I was after info from you guys weather headers would be worth doing at the same time or not ??

dannytwo

iTrader: (5)

to be honest mate i would'nt bother unless you are going for 400 plus!
ye the spool up is better,but not a big differance
Also you can lose the subaru burbble,depending on which headers you choose.

Dannytwo

greatgonzo

iTrader: (1)

Cheers for that mate I think you are right!!

ade_sti

iTrader: (2)

would not bother with headers like stated above. Just get exhaust - decat downpipe and remap. would not even bother with filter - they are all the same. You will get 320 with that - enjoy

Had tubular header on my impreza - not good unless over 350-400 bhp and with big turbos.

nixxon

You can pick up a Prodrive sports cat for about a ton. It's 200 cell per inch, but the cross section is big, so you shouldn't lose much over a de-cat.
The cheap sports cats may be 100 or 200 cell per inch, but a small cross sectional area, meaning less flow, and less ponies.
Cheers, Nick

greatgonzo

iTrader: (1)

Nick i was under the impression that the Prodrive sport cat was only good for the 2001-2005 models??
Most of the advertised exhausts are as above never seems to be many for the 2006 2.5 litre

Mikkel

320 bhp... you could achieve that with just a remap and no mods mate.

I have a decat downpipe that replaces both cats, a filter, fuel pump (not really necessary sub 400bhp) and some better spark plugs. With a remap my car made 360bhp/390LbFt. The latter is the most important number, especially on our cars with the 2.5ltr engine, as it will really make a difference to the performance. I now have power just about every where and don't need to change down half as much as I needed to as standard. There is literally no lag with the VF43 turbo and the 2.5ltr engine.

greatgonzo

iTrader: (1)

Is the VF43 the standard Turbo for our car?
What plugs are you using?
that sure is very impressive,i have read on here of people spending a lot of money to achieve figures like that

Mikkel

It is the standard turbo yes. All UK spec hawkeye STIs get the VF43.
I forget the exact number of the plugs but they are NGK 7 something or other (I'm not mechanical and get experts to select and fit these things for me ).

It is not even an aggressive map to get that figure. I know a few lads who have seen slightly more.

You would spend a lot to get those figures on a 2ltr but don't forget you have a 2.5ltr engine. Costs involved for me:

Plugs £40
Fuel pump (optional sub 400bhp) £80
Filter Free with exhaust but usually set you back around £30
Magnex decat downpipe £200 (this was price new but you could prolly get cheaper second hand). Expect to pay £2-400 for a sports cat.
Remap - group buy with Andy F around £550.

I also bought a deresonated centre pipe and racebox back box for £350ish but this is not needed if you are happy with standard. More aesthetic/noise than performance.

Add fitting costs if you can't do it yourself/don't know anyone competent.