I'm not looking for a screaming loud exhaust after all the car is going to remain a factory 318 2 barrel. I just want something with a little bit of a grumble.
These are what i used on my 273 66 cuda 2 1/4 true duals bumped up to 2 1/2 for Magna Flow Magna Packs mufflers back down to 2 1/4 and bumped up to 2 1/2 for these tips. And yes she is obnoxiously loud!!!
Mine is a 3" with H-pipe, TTI 2" headers and Borla XR-1's. Engine is a 440. It's quieter than 2.5's, no H, Flowmasters and schumachers. I've always found that larger diameter is quieter as well as an X-pipe or H-pipe.
Your car really doesn't need 3" pipes though. I believe TTI also makes a 2.5" exhaust. I'd go with that and use anything except flowmasters. They'll drive you out of the car with drone.