[Rare Iron]

Matt, what do you want to know??? They don't reduce the noise levels very much, & they restrict flow quite a bit. Like sticking a potato in the tailpipe. On a sidepipe exhaust like a Cobra,the only way to reduce noise levels without replacing the muffler sections is to stick an obstruction in the flowpath (& that kills HP). OR, replace the mufflers with mufflers that do a good job of controlling the noise & ones that flow well.