I have a set of CMI's that came with the 502 I bought. They appear to be good with no signs of previous leaking.......but......there are so many horror stories out there about CMI's leaking, that I'm concerned about using them.
My other option is to use the 496HO manifolds from my other motor.
Not as much bling with the 496 exhaust, but I would have peace of mind that they wouldn't leak.
Opinions?