mopar sound

It depends on how you define 'coolest sound'. My Dart has 2-1/2" pipes, a pair of Summit turbo mufflers and turndowns in front of the axle. Simple and cheap, yet effective. It does tend to resonate a bit at idle if you are not moving more than 5mph or so. And it tends to set off car alarms in the parking garage. But otherwise, I think it sounds pretty good for a 318. :)