RE: Stock muffler and CAT delete question? 04.5 ram
I am interested in doing the same thing. But..... What is removing the cat going to do the the fuel milage. I think someone on this forum said oncehe removedhis cat, the mileage went down like 1.5 mpg. Not doing anything the the truck, except a aero 4040xl, and removing the cat. Will mileage go up,down, or stay the same?