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Old 03-17-2013, 03:18 PM   #1
Scooby Newbie
Member#: 326861
Join Date: Jul 2012
Chapter/Region: SCIC
Location: inland empire
2015 STI

Default going from a 2.5 to 3" dp

hey this may appear like a noob question but I thought it doesn't hurt to shoot this question up on the boards. I have a 2010 wrx and originally planned to keep my catback stock so I got a cobb catted downpipe that tapers to 2.5in when it meets the midpipe, but now after upgrading to an invidia q300 3in exhaust, I'm contemplating switching to an invidia 3in downpipe to match. So my question is when upgrading from a 2.5in cobb downpipe to the 3in invidia dp is there warrant for a retune? TIA
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