i think we need a video with audio also LOL

 

X2 To that ^

 

Iv been around many 6.0s and they all have that loud whistle. most 5inch whistle louder than others but the 4inch will scream pretty good. id say if your gonna spend the money for a full turbo back exhaust why not get a 5inch?

 

I've heard the 4 inch is more beneficial than the 5 inch unless your running a high HP application...

 

it really doesn't matter that much after the turbo, plus you can BARELY fit the 4" down pipe on the 6.0 well atleast on my 05 it was a pain in the *** to get it on and everything, but i loved the sound of it i had 4" turbo back straight pipe with a 6" tip at the end, it screamed pretty darn good with a PPE on it

 

For everyone's opinion on my truck when I get it. Done I make a video to post