Flowmaster Super 40 vs. Original 40

If your ears are ringing I may be in trouble. My 69 383 S has 11.5 to 1 compression and Hooker supercomp fenderwell headers. This spring I am putting on a completely new 3 inch system with an H pipe and Dynomax Ultraflo race mufflers. I may go to 2½ inch for the tailpipes if the 3 inchers are too much of a pain to fit and neck down to factory tips. I guess this thing is going to be LOUD.