I used a 2.5 inch Thrush exhaust system on my 74 Cuda.
The fit was pretty good, had to trim the tail pipes to fit.
The pipes are not madrel bent but the are not wrinkle bent, sort of a combination. I am sure there are better performing / flowing systems but for the price I think it was worth it. The kit has a H-pipe and sounds pretty good.
You have to look through sumitt's web site to find it, it does not pop up in the usual search. You can also find it on thrush web site and search the part number on sumitt's site.
I tried the Sumitt brand kit as well, nice made kit, but did not fit the cuda at all!!!
Good luck.
Jason