I have my 6.7 Cummins and the truck has 9,000mi on it. I dont want to void any warranty and I dont want to remove the DPF yet, just the muffler. I was wondering if I will gain any power doing this and if my fuel economy will improve?
Thanks

 

i wouldn't bet on much gain, except maybe in decibles. but i didn't try it, i just went straight to deleting my dpf and egr.
with the stuff in my sig i notice significant gains in power, MPG, and fun.

 

The muffler is there for looks.

It's a strait through design to reduce possible drone in the cab.

If you want cooler EGT's and a better flowing exhaust, just get a 4" TBE.