Rcm headers or ported headers
 

My goal is about 400-420 bhp would ported headers be okay or would I need rcm spec headers at this level?

Generally ported headers are good for around 380 to 400 bhp at which point the benefits of tubular manifolds become apparent.
I used Lateral's GT spec manifold and 3 bolt up pipe when going over 400 and was pleased with the quality and increased performance.

Tubular ones possibly then

At the level you're aiming for RCM (GT spec) headers coupled with the 'Harvey' up-pipe would be of benefit. Don't forget to budget for wrapping headers and up-pipe.
Talk to Aln at ASPerfprmance.

JohnD

RCM headers are supplied with a ported upipe :thumb:

I think John was referring to a harvey trick up pipe. That is different to a normal ported up pipe.

Yes, it's got a venturi profile to speed the gases before entering the turbo.

JohnD

I had Lateral headers on my blob eye where awsome

Cheers glenn

R the lateral and rcm ones the same or is there any difference?

lateral RCM GT spec all the same.

Just a word of advice, if you plan on buying the RCM ones then DO NOT buy them direct from RCM.
They are available much cheaper from advanced automotive.

http://www.advancedautomotives.com/r...eza-1741-p.asp

Same manifold but without the 'RCM TAX'.

£450 + £80 for fitting kit

R the afterburner ones that scoobyworld sell the same or different to the above mentioned?

they are ****e.

as said rcm,gt spec or lateral all the same and the best dont bother with anything else.

ive got a set under my bed ;)

RCM charge £594 for the same manifold.

And you don't need an £80 fitting kit.

Went for the above in the end, thanks for the link
:thumb:

Old post...however will the car not push 400+ bhp on standard headers
Does Channing the headers make the car sound different? The subaru burble

No, with the rcm manifold that’s equal length it sounds pretty much the same.
Mid you swap to equal length then yes you loose the burble

Imo the burble is much pronounced on the std set (having run both).

Ported std headers will get 400, but you will need the supporting mods. A very good 2.5" or 3" turbo back etc.

Are these standard on a STI 05?

As I have been told 400 - 430bhp is possible with standard headers...as no mapper has mentioned this ..