I had mufflex make me a custom y years ago. Honestly, it wouldn't have been so expensive had they not sold me cats that cost something around $200-300 a piece. Just make sure you tell them what you want.
my buddy is getting his exhaust done at this place. I like that they have oval tubing too for extra clearance for the Y:
http://www.mandrelbendingsolutions.c...let/StoreFront