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

perfacar said
on my 66 dart, i run just the resonator, sounds wonderful, had one guy say, never new single exh could sound so good.

The HP exhaust started in 65 with a straight through muffler. There were too many complaints about excessive noise so they added a low restriction baffled muffler. See this post. 1965 Formula S 5800 miles