Right now on my 2006 F-350 i have everything stock except a k&n air intake system and I straightpiped it (cat back). I am still running the stock 3.5" piping. My question is if i spend the money for a MBRP 5" straightpipe turbo back, will there be a noticeable change in power, MPGs, and noise...

Hey guys Is there really a differce between 4" and 5" turbobacked exhaust even with the manifold only being 3 1/2"? If so is it worth the price difference? Also I want the deepest loudest exhaust possiable. Any suggestions, thanks

I love the sound of my 7.3 but i just wish it had a little bit more exhaust sound like the cummins does. So what would be a good way to get more exhaust sound out of 7.3? What exhaust system would be the best? and have good flow also