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It came with DynoMax Turbo mufflers. They are oval, and the body of them is 20 inches long

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That's strange to me as my 66 Coronet convertible w/440 RB; Dougs 2" headers and 2.5" exhaust has no drone whatsoever. I wonder if the 3" pipes is a factor? Or maybe how their hung under the car?

I've been recommending these mufflers since I put them on the car thinking they were the best, but maybe not...

These are they -

http://www.jegs.com/i/Dynomax/289/17749/10002/-1?parentProductId=