I have the MACS for the "P" heads and had the ceramic coated. They don't have individual flanges so there hasn't been any re-fit problems.
However, I just looked up the FMS units in my catalog and they're only $315 list. I would definitely go with them over the MACS for that price.
[ December 10, 2002, 12:05 PM: Message edited by: n559br ]