B4 you slam the oem, understand that if you go to a aftermarket exhaust
(after the cat) on any audi app, you will realize no performance gains
WHATSOEVER (it might sound better tho) on that exhaust unless you increase
its effective diameter...... Even then, you're better off spooning that
honeycomb cereal box b4 the exhaust.... The audi/BMW exhausts are prolly
better freeflowing than any aftermarket system you'll get your hands on, more
or less expensive.... NOT just thinkin here.... Been there, don't go......