I've ran 3 dyno pulls with the mods listed in my sig. Zero gains, I have no idea how MBRP made 29hp from their exhaust. If you see my dyno sheet, the before and after mods pawer curves were almost on top of each other. I think you should just look for the sound from a cat back exhaust. IMO, Zoomers and MBRP make the best soundYeah I really like those retro tips too. MBRP claims 29HP gains with their system
Hmmm, not sure what this "flutter" sounds like but seems like that's just with the quad tips, how about with the stock tips?