I think it's made by Street Performance, I'll probably know after this weekend when I go back to the shop to order my Accel ignition.
I don't know any details but would like to know, I'm running a drop-in K&N filter in my stock box right now.
If the Air Max doesn't do cold air (I think it does) I probably won't bother. I hear people say cold air is better for performance.
I'll post back here soon as I find out. My roommate is putting one on his '01 XJ 4.0L, I'll know at least from his how big a difference it made.
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