Well I chopped off the old exhaust before replace the whole exhaust system. Droning and off idle vibration changed slight in the tone but not substance. Interesting how dumping exhaust right after mufflers adds a low overtone to sound of whole system. Replaced old 2/14" with 2 1/2' system. Really awesome sound but after gas tank repair I will run tail pipes over axle or out to rear panel.

Anyway only possible component left to replace is torque converter. My tranny just started going bad so that is next on the list....