What type of exhaust does your 273 have??? show some photos!!!
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.
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.