65 and 66 Hp cars had a high perf exhaust system. The trans crossmember is formed for only one pipe. The hp exhaust has a 2 1/2" y pipe and intermediate pipe going into a hp muffler. The over axle pipe is 2 1/4"
and finishes off into a resonator with a squared chrome tip. The system is still available through Accurate Exhaust Products. Toolmanmike
