Currently have a Invidia Q300 installed on my v36 sedan and was wondering if anyone has done a muffler/axleback swap with Invidia's. I want to make it a littler louder than what it already is since it is a quieter setup. Also have isr test pipes installed and it makes it a little louder, but kind of wanting more out of it. Just seeing some ideas if I should change out the mufflers or if I should just consider looking into another catback. Any help is appreciated.