[STiMaxPsi]

I was wondering what would be a good choice of Downpipe to go with HKS Carbon TI for my STI. Anyone with a suggestion is greatly appreciated. Thanks. What is a Boost creep???

[12SecSTI]

I would answer this but you want an answer from an expert.

[Paperchasin]

here u go..
http://forums.nasioc.com/forums/showthread.php?t=477715

[Paperchasin]

most aftermarket DP's ive seen use a bellmouth opening...wait, wut am i thinking....read this...
http://forums.nasioc.com/forums/show...hreadid=445812

[suzwrx]

I also have the HKS Carbon TI and I went with the Helix DP but I'm not an expert or anything

[yohan7]

Does anybody have the Godspeed dp? If so, does it eliminate the mid-pipe cat? I'm either contemplating between this dp or txs stealthback.

[Brahmzy]

I've got the TXS and love it...Big ol' friggin thing.

[jtheday]

perrin is nice... uses a separate dump tube with a diverter which sticks up into the turbo to separate the wastegate flow from the rest of the exhaust flow. the flanges are nice and thick too, 1/2 an inch to be exact. this could help prevent premature breaking of the welds and reduce any possibe warpage.... time will tell

[crtillmanspeed]

txs is lovely... just need an axle back now!!

[Mach1STi]

i LOVE my pde catted dp! expensive but sweetazz

[bizkit642]

I like my invidia dp

-Andrew

[Datadatum]

Paper - two worthwhile links.

[evo_killer]

Do you need to tune after putting on a helix downpipe? And which is better, helix or invidia?

[Scudetto!]

Was wondering if the Japanese and US branded downpipe would fit both the JDM twin scroll and the US sti's?

[kool168]

Originally Posted by evo_killer

Do you need to tune after putting on a helix downpipe? And which is better, helix or invidia?

both should be the same... anything with 3" bell mouth is great.
dp is not a problem, you should be thinking about wut kinda CEL fix you wanna get since CEL is the most annoying thing