Metal2You Posted August 26, 2008 Share Posted August 26, 2008 I believe the stock mid and Y pipes are 2.5 inches in diameter. Link to comment Share on other sites More sharing options...
Guest LGT-NY Posted August 26, 2008 Share Posted August 26, 2008 I think they might be 2.25 actually. Not positive. Link to comment Share on other sites More sharing options...
scoobydoobie Posted August 27, 2008 Share Posted August 27, 2008 2.25 sounds more accurate. Anyone replaced their catback that knows for sure? Link to comment Share on other sites More sharing options...
korpsepatrol Posted August 27, 2008 Share Posted August 27, 2008 yeah it might be 2.25 at the mid but the y is way smaller like 1.75 ish. -George 2008 6mt Legacy Gt Spec B DGM - Not so Stock/Work in progress 2006 5mt Legacy Gt OBP - Sold 2005 5eat Legacy Gt OBP - RIP R.I.P Coxx Link to comment Share on other sites More sharing options...
vet Posted August 28, 2008 Share Posted August 28, 2008 2 1/4" mid-pipe, 1 5/8" after the split. Link to comment Share on other sites More sharing options...
FiftyTwoEighty Posted September 1, 2008 Share Posted September 1, 2008 TMIC if you get it tuned for the increase in flow. Conservatively, expect 10 to 15 more peak HP with an expanded torque curve. Many say that the same is true for headers but both of them require a tune to get the most of it. Link to comment Share on other sites More sharing options...
Infamous1 Posted September 2, 2008 Share Posted September 2, 2008 TMIC if you get it tuned for the increase in flow. Conservatively, expect 10 to 15 more peak HP with an expanded torque curve. Many say that the same is true for headers but both of them require a tune to get the most of it. Not even close... Link to comment Share on other sites More sharing options...
praedet Posted September 2, 2008 Share Posted September 2, 2008 ^^^Well, that was some data posted a while ago from PDX... Link to comment Share on other sites More sharing options...
Infamous1 Posted September 2, 2008 Share Posted September 2, 2008 ^^^Well, that was some data posted a while ago from PDX... You mean the same PDX that were practically partners with Perrin Link to comment Share on other sites More sharing options...
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