Kedlestone

iTrader: (9)

Story so far...

MY54 WRX running;

VF34
550 injectors
Full decat, 3>2.5"
STI TMIC
Walbro 255
APS induction
Simtek ecu, AL,LC

It's currently running 346bhp on V-power.

Question is, what gains and benefits do GT Spec headers offer over the OEM. From what I've seen a lot of people say to get a matched up pipe when changing the headers, why is this? Also if said headers were fitted would this require a map tweak?

Thanks in advance

barnshaw

iTrader: (1)

at that power level ported headers would be cheaper, much better and give you good results, with matched up pipe, tubular headers apparently not really required until over 380+

Kedlestone

iTrader: (9)

Ok so what do the ported headers give that the OEM ones don't? Better flow rate?

tubbytommy

iTrader: (20)

as said above you dont really need tubular ones, get intouch with harvey about some ported ones.

Kedlestone

iTrader: (9)

Just dropped him a pm, cheers.

BlueBugEye

iTrader: (12)

I gained circa 400 rpm of spool on ported headers and up-pipe both from Harvey so that gives an idea of the gains.