ya it is def the high flow cats that gave me the loudness and sound your talking about. And no, most exhaust shops do not carry hi flow cats and you have to make sure u find and exhaust shop that will install them for u

hey man, badass truck! i have true dual straight pipes dumped too, but mine arent as loud as yours, is it because you have an h-pipe or the fact that you have high flow cats that gives your truck the sound it has?? i have stock cats and no h-pipe btw, and i know you can buy high flows off ebay but do u know if exhaust shops carry em??