I have decided that my next mod is going to be a downpipe but i would like to know first, (1) which downpipe has the best performence? (2) which has the best fitment? (3) and how much of a difference will i feel on my ass dyno?

 

i say just get the helix up/dp combo from gruppe-s ... thats what i would do. But if i had unlimited money i would prolly get Perrin up/dp.. .

 

helix all the way

 

I was thinking about getting helix from the start, but i just wanted to know from somebody who knows from experiance.

I was also looking at perrin.

 

Turbo XS 4 1/2 d/p. and on the dyno i dont think any other turbo back came close. Its a perfect fitment, however the oem heatshield will not work.

Turbo xs bellmouth 4inch
3inch bellmouth, hexil,aps,perrin, exct all also good choices.

 

I have the Helix v2 downpipe and I gotta say that I love it. It has a great finish and you can really tell its a quality product. It also has a sensor bung so you can plug maybe for EGT [although I think I would go for the hottest cylinder; probably #4 on the exhaust manifold/header].

My buddy has an O2WRX also with turbo, exhaust, reflash, full exhaust including headers coupled with the Perin, but he has a hairline crack on the uppip- to-Turbo flange I believe.

Go with the Helix up-pipe, because it has that sweet flex portion.

Oh and one more thing, I don't know necessarily how good or bad it is, but DC Sports makes a comparable one to the Helix up-pipe for relatively cheap - around $110 on eBay.

http://cgi.ebay.com/ebaymotors/ws/eB...category=33742

Hope all this helps.

 

I still dont know which one i should get. What is the difference between the bellmouth and the Perrin where the wastegate has a pipe that meets more toward the middle.

 

http://forums.nasioc.com/forums/show...hreadid=445812

Thats all in info you need

All you new Subaru guys need to get registered into Nasioc, that is one of the best subaru sites out there.