I don't like the sound of the Corsas. The Sport sounds too much like a semi.
I have an XtremeFlow Thunder Chamber on its way. A couple guys here have it and I love the sound of it. Nice deep rumble, and the X-Flow guys seem to have their sh!t together on H2 performance.
Damn, they owe me some $$ after that!
I'll post my opinion of their product after it's installed.