Thanks Tom for the links. They didn't say it but Boom Tubes may be the secret. I've been wondering about those. Flowmasters surprised me but that's OK. I may already have a better engine but not a better sound. Talking to Silver Sport now about the trans.

‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500