Hell yeah they do! I don't know about the 9000, but my 6000 is pretty mild at idle and cruise but by God when I floor it you know it!
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I wouldn't trade my spintechs for nothin.. I love the way they sound.. Now as soon as I can get the cam in, ole black should sound really mean..
I have a 9000 ready to go on mine. But I'm hoping with the cats and a full tailpipe out the back it won't be so bad. They do sound awesome.
3030 put my old dual Spintech setup on his truck when he split his muffler. It was obnoxious loud. I'm gonna be running his old cam, but in a stock 5.3 with a single pro street 3" in dual 2 1/2" out. It should sound pretty mean.