Drop that boat anchor off your Mach Z and install our new lightweight muffler! Our lightweight muffler weighs only 8 lbs and offers throttle response and an actual dyno proven horsepower gain! A 3-4 HP gain on a muffler, it doesn't happen often but we did it on this one! We take pride in developing a muffler that works great without being loud. Our muffler is fully baffled and has a nice deep throaty tone only slightly louder than the stock setup. Fits all 2005-07 Mach Z and Summit 1000 models. Has SDI sensor port. Optional AFR bung available for running an AFR gauge (please call).