i agree with hen avenger those clips dont sound good at all ....i think that u should use the noise that a 6.0 puts out to the max those clips need a little more crackle and tone
this is my truck i have an 01 silverado hd wit the 6.0 and i have flowmaster super 44 love the sound od it its got a really good tone to it!! you should put this on if you want a mean sound