Help guys EPA noises2k

[vyets]

How?

Oh whoops, this is OzHonda.

We all started somewhere bud.

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..

youtube it if you don't understand how it works