I just bought a 2000 limited 5.0. I just installed a Mac cold air intake kitand wow what a difference. I am looking to add a cat back exhaust for a little more power but I would still like to keep my ride nice and quiet inside. Maybe some of you guys can help. I have looked at the flowmaster, mac and gibson and I can't decide (gibson claims only 2-4db in the vehicle. What do you guys think?