I'm looking at adding an exhaust to my crewcab. I'm only looking for the muffler and will be keeping the original plumbing. I had an 01 with headers, high flow cats, and borla and it sucked big time. I spent tons of greenbacks only to trade because I was getting 12mpg and lost back pressure.
The back pressure was fixed by adding the original cats back to the truck. It worked. The truck ran faster and sounded good except for a freaking drone the borla carried and the mpgs.
Has anyone added a muffler only to a crew with the 4.7L and lost back pressure? I want to research this some before I go throwing money away.
