Well, I've got my 5" installed this morning. It's sounds awesome! Not any more of that raspyness that the 3" without the muffler made. The only problem is that I think I have to have a fueling box with this exhaust. I think my ECM is starting to defuel real quick because the boost builds so quick. Turbo lag is barely noticable now. When I get back to work, I'm going to try and record it.