I have an 02 Yukon XL 1500 with a K&N CAI and a magnaflow cat-back. I'm lookin' for my truck to have a real good roar to it but I do not want to spend more then $500-$600 on headers. Any opinions on a loud set? And has anyone had difficulty unbolting the stock headers from the stock exhaust? Because I had to torch the bolts on my stock exhaust flange just to get the bolts to loosen to put on the cat-back.