Quote Originally Posted by greek_rambos2k View Post
wouldnt the varex damage the s2000 as air cant escape fast enough when its closed?
I dont believe so. When the butterfly valve closes, the aim isnt to air seal the muffler.. its has a bypass where the exhaust gas travels up and down the muffler length a couple of times, like your stock muffler, and then passes out through the end of the muffler..