Ok, not sure if it was out of boredom or because I felt a need to give my neighbors a break, but I put my factory muffler back on today. With my Blitz intake and PDE uppipe & downpipe, the Blitz rear section muffler was too loud! Don't get me wrong, I love the sound of a rabid rally racer...however, I was wondering if the restrictive rear end will cause any kind of bad back-pressure effects up at the turbo end? Help! Thanks.