Got the new gasket on, tightened everything up tight and it sounds good, no can rattling sound, only a deep thrum. I can feel the power too. Still get a slight smell of exhaust sometimes.
And when I hit 3,000 rpm there's a high pitched buzz that sounds like a cricket from beneath, think I need to tighten the flex pipe a bit more. I actually like the cricket sound.
Gonna give it a couple days and then re-tighten everything.