I'm running dual super turbos on 2 1/4" pipe from the cat back. I'm real pleased with the sound, but needed to add a bullet resonator to cut down on the drone under 2500 RPM. Not very original but it sounds nice and low, not to loud, and zero rasp. The super turbos will rust and the 17731s will hang down a bit below the bumper valance if using a straight tip. I painted mine black with hi-temp paint and notched my valance to tuck the muffs up as far as possible. (See pics in my sig-link.)