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I was given this by a friend, who got it from a coworker who said it's for "an RX7" - not sure what's with the fittings going to ~ 1/4NPT but I'm curious if this is actually for an FB or something else. If it will fit and pressure tests okay, I'd consider swapping it in place of the beehive... eventually. It looks to be in pretty good shape, just dirty and a few dings on the outer fins.
I also agree that its an FC oil cooler. It can be made to work. There are writeups here on the forum on how to do so. They do work quite well and not have the frequent cracking issues associated with the SA and GSL-SE oil coolers.
