I have a weird mash-up now of what came with the car vs what I added, but it sounds pretty cool.

At this point, I have Doug's headers going into a 2.5" X pipe that reduces to 2.25" to a couple of Flowmaster 40s before the axle, and then angled dumps by the rear quarter corners.

The Flowmasters really sounded like a boat in a tunnel on the stock manifolds. My first set of full-length headers really changed the character of it. Adding the X-pipe gave it this crazy tone shift past about 3k or so that makes it sound like a late-model Mustang.

This is a stock Magnum 318 btw, I'm not restricting myself with the tail end wink

BTW, nobody needs backpressure. It has been dyno-proven over and over again. We don't have 2-stroke motors. You sound like a friggin cave relic trying to give people that "advice" nowadays.

1967 Dodge Coronet Deluxe station wagon

1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s