I have an 07 Subaru Legacy limited gt and I fabbed up a 3inch catback straight pipe(sounds horrible) besides that I was wondering if I need a retune. I already have it tuned because of catless downpipe, tgv deletes, air pump deletes, and airbox. Just making sure that it’s not going to effect it at all. Because the stock exhaust it a 2.5 inch to the ypipe, but now it’s just a 3 inch all the back single pipe.
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