Don't know what the 2 04 means but, I'm running a B1 built by Ken down here in Phoenix. Have had this turbo for almost a year now, I like it, and think it works well all around. It's perfect for 450-500 HP apps. It spools up pretty quick (small puff of smoke, then gone), keeps EGT's cool, and is very drivable. I tow w/it and have NO EGT probs.