Sounds great, nice low rumble on idle, but sounds mean when you get on it. These plus a flush hard bed cover and i seem to be averaging a 1-1.5 mpg improvement in gas mileage. This particular magnaflow is a direct fit for the dual exhaust Ram 1500.UPDATE: I forgot to update this sooner and it's been a year now...The exhaust has been on my truck now for over 10,000 miles and the sound is amazing. The truck no longer drones when the MDS kicks in...Somehow, the burn in period helps reduce this. Dont get me wrong - Its still there but not nearly as bad as the first day...go figure.