Anyone strait pipe an 07 5.9? Is there any extra emissions stuff being an 07 or is it like the earlier 3rd gens? Any performance or mileage gains? I know my 98 12v had a little better fuel econ when I did it.

My 98 12v was strait piped with 4" and was awesome.

 

Its like the old third gens sounds way cool But the drone is horrible pulling a trailer try leaving the cat in supposed to be less drone. I ended up adding a 4" flow through muffler to mine but it sounds a little tinny now.