simpsonaldinho

Hi all,

Looking to order my parts this week - Currently standard newage WRX apart from backbox - I will be going for filter, up pipe and scrubber decat, leaving standard cat in place in downpipe, so once mapped expecting between 260-270bhp.

However i'm a bit stumped at which up pipe I need (going for Hayward & Scott)

http://www.haywardandscott.com/subar...to-350bhp.html

http://www.haywardandscott.com/subar...e-up-pipe.html

I emailed them and they advised me the difference is only size , the small one is 13/4" OD ( 15/8" ID ) and the big one 21/8" OD ( 2"ID )

So my question is, which one will be best for my requirements and expected power output?

Cheers