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Old 04-16-2009, 09:59 PM   #3
Ogden
Scooby Specialist
 
Member#: 1748
Join Date: Jun 2000
Chapter/Region: NESIC
Location: Boston, MA, USA
Vehicle:
'09 Outback Sport
OBP over DGM

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Quote:
Originally Posted by Gr3en View Post
I am wondering which one flows better? I know the diameter of the borla is bigger, but since the stock is almost EL, would it flow better? it just kinda popped into my head on my way home from work today. It seems like I have lost some down low power on my RS, but I can't think of why?

I have Torque grind cams from Delta
Borla UEL headers
STi Mid-pipe
Devil Axle-back

Any thoughts?
What's the overall diameter of the piping in the exhaust?

It seems like when the piping gets too big for the 2.5i, it costs you on the low end. I think that most folks say 2.25" to 2.5" is about the size you want. Anything bigger and it starts to cost you in the low end.
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