Twin Scroll Headers

[snwmbl]

How does the performance of the factory TS headers compare to aftermarket options? Im thinking factory headers, custom up pipe, and an EFR 7670. Appreciate any input!

[Kiwi_Fozze]

What power level are you going for?

[Guest]

Dont bother get a holset and cams for the same money. Similar or better results.

[snwmbl]

More the quicker spool i'm after (block couldn't handle too much more power in its current state.. god dammit). Currently have a GT3082r making close to 400kw. Thoughts were I could get good coin for my current gear (Sinco equal length headers and up pipe, Tial 44mm EWG, GT3082r with anti surge cover, 3" down pipe with EWG plumbing) to put towards a TS set up.

[Guest]

Is your wrx the white 2.35 one nzpc have been jabbering about?

[Guest]

Ahh yes it is. Go hrc40rs and small runner t/s setup. Cheaper and bulletproof.

[snwmbl]

Thats the one. Anyone running that set up on here?

[Jono24]

Gotasuby ran a bigger holset, I'd ask him, think he had an hx40 forsale.

[Guest]

Rac ran an hx3540 s/s on a ej25/v3 sti hybrid. I ran a hrc35/2 12cm on a ej257 with legy t/s headers. Gotasuby ran an hx35 on 2.5/avcs heads/legacy headers.

I made 20psi by 3k and no problem hitting 20psi in 1st gear on a safe home tune.

[Guest]

The transient response and power curve felt n/a it just pulled harder and harder. No noticeable hit of power like a single scroll garrett setup.

No idea on power with mine but it would light up 1st thro third and wouldve gone 4th but never tried.

[snwmbl]

Sweet! Mine kicks in at about 4200 with a .82 exhaust housing.. don't get me wrong - its bloody good fun in a straight line!

[Guest]

 snwmbl said:

Sweet! Mine kicks in at about 4200 with a .82 exhaust housing.. don't get me wrong - its bloody good fun in a straight line!

Real **** on the corners?

[snwmbl]

Haha It's the exit speed from the slower corners.. The quicker ones are fine - pin it and hang on!

[Dairusire]

PBMS swear by the factory STi headers and say if you've been unsuccessful at finding STi one's the Legacy headers are your next best bet. Aftermarket headers are apparently 9/10 times worse than the factory ones due to going to large on the pipe diameter, slowing down EGV's (exhaust gas velocity)etc.

Personally I'd do what EvoWRX is saying and get either Legacy headers (or STi) and fashion up an up-pipe to similar pipe sizes are factory, then a Murch Holset. Speak to him about what you're wanting to do and he'll be able to sort you right.

Either that or buy the up-pipe/WG/turbo combo that EvoWRX has

You also don't need to go dual WG's either, you can merge it to a singular WG with no issues.

I think the Borg's are too over priced (albeit fantastic bit of kit) considering you can have a Holset do EXACTLY the same.

[Guest]

Holset like a small runner. Pretty much every other turbo needs a decent sized runner. Perrin have done back to back testing pretty sure 600kw is where the big runner makes a difference otherwise stick with the sti header.