Like most of the Commando package, it was hard to beat in it's day. The resonator was only part of the system. The Y pipe fed into a 2 1/2 OD piping to the muffler, which was straight through. Then it exited the muffler into a 2 1/4 tail pipe to the straight through resonator. The resonator was needed because it was too loud with 10.5:1 compression and only one through muffler (I had to try it). I also tried custom duals with turbo mufflers, but saw no difference in performance. You can still get all the right hangers also. I am happy with it, it sounds awesome floored running full out. I am even considering putting that system on my son's "73" 318 Dart.
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