Just a little info on the mufflex kit. It sounds great at startup, at idle, and when running down the road. Love the sound makes it sound like a hemi should. The bad: if ya tow a lot the drone will kill you. It drones a bit when on the highway empty between 1500-1800rpm but it's liveable. But any load or trailer towing it's pretty bad. Just my two cents for anyone considering it. I'm back to stock muffler with the butterfly knocked out and the resonator removed.