'65 GT 273 Conversion

The ones with the more even finish were aluminized. It is tough for me to get my head around the idea that Mopar would make them using aluminized or galvanized steel using the same part number. Maybe it was a supplier issue. IDK.

My 66 GT Dart Charger had an aluminized resonator. It did not have the ridge running along the bottom of the resonator extending onto the chrome tip. IIRC the '65 273-4s were criticized for being too loud. The muffler used was very much like the Dynomax Ultraflow. My '66 had a reduced restriction reverse flow muffler. It was pretty lame compared to a friend's
'65 Formula S.

A number of people on FABO recommended I weld my exhaust system together instead of using clamps. Be very careful welding anything made of galvanized steel. It could make you sick. https://en.wikipedia.org/wiki/Metal_fume_fever

Interestingly enough, both of the 66s (GT, 273-4; 270, 273-2) I restored had only one welded area on the exhaust system. That was where the left and right cylinder bank pipes met. The rest of the system's pipes were joined by clamps.