factory exhaust manifold ID

I'm pretty sure Flowmaster has a complete American Thunder exhaust kit for A-bodies too. I know I've seen a Youtube video about it. Not sure if it's made to hook up to headers or factory manifolds. Also, I think Magnaflow has an E-body kit. You might see if they offer something for As too. I went with TTI for my 68.

If you want a factory style system(not mandrel bent) with factory pipe sizes that will bolt right up, Accurate Exhaust makes factory systems too. I have an Accurate Exhaust system on my Challenger.