Just do yourself the favor of looking at Magnaflow... I had an 05 1500 5.7 hemi with a flowmaster super 40 on it for a 'loaner' truck from the dealership for 4 days last week, and I still can't shake the headache from the drone... I went so far as to climb under this truck just to look what exact muffler was on it so I never bought one... [8D]