I know that Summit Racing sells a mandrel bent dual exhaust. You can get it in either 2 1/4 or 2 1/2" piping. It is a header back system that exits in the rear below the bumper as a stock style exhaust would. I also believe Jeg's has the same. I put the 2 1/4" one from Summit on my 75 and it fits like a glove. But it is a header back system and 75-77 should have a 74 or back double hump transmission crossmember for proper fitment. I think they also sell down pipes from the manifold separately. I also at the same time installed a pair of Summit 4 tube headers. They required some denting to fit on the driver's side but they were cheap. The exhaust system comes with all hangers, clamps, hardware and 2 turbo mufflers. It even sounds decent on the low compression 400. I did the install in a 1 car garage with a floor jack, ramps and jack stands. It was fairly easy as far as the exhaust goes but the headers were another story. It was easier to put headers on my 89 Formula 350 than it was on my G.P. Pontiac V8 and bolt on headers don't exist in the same language.
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