I'll be the first and more than likely only one to throw a vote for Mac's Flow Path catback. I love it, loud, rowdy and nasty, especially when paired up with an uncatted mid pipe, I like the Prochamber a lot for that.
"Posterity! You will never know how much it cost the present Generation to preserve your Freedom! I hope you will make good use of it. If you do not, I shall repent in Heaven, that I ever took half the Pains to preserve it."