b3nmw

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

MattyB1983

iTrader: (51)

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.

b3nmw

Tubular ones possibly then

JohnD

iTrader: (5)

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

BadBadLeeroyBrown

RCM headers are supplied with a ported upipe

MattyB1983

iTrader: (51)

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

JohnD

iTrader: (5)

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

JohnD

STI Glenn

I had Lateral headers on my blob eye where awsome

b3nmw

Cheers glenn

b3nmw

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

fat-thomas

iTrader: (4)

lateral RCM GT spec all the same.

MattyB1983

iTrader: (51)

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'.

b3nmw

£450 + £80 for fitting kit

b3nmw

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

fat-thomas

iTrader: (4)

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

MattyB1983

iTrader: (51)

RCM charge £594 for the same manifold.

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

b3nmw

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

SamUK

iTrader: (1)

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

joe v3sti

iTrader: (8)

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

Henrik

iTrader: (5)

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

Power Junkie

iTrader: (1)

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

SamUK

iTrader: (1)

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 ..