I'm new to this forum and have had a 2014 wrx for a year which I just upgraded to a 2015 wrx. The 2015 is a salvaged title so it came with some surprises... it has a invidia j pipe and downpipe, a nameless mid pipe, and a nameless exhaust delete which I replaced with a stock still quadtip exhaust. Now I'm just wondering if the aftermarket parts are bad for the tune thus damaging the exhaust. I'm sorry I'm new to this so help is really appreciated.