I agree!!! I bought that MAC P.O.S. elbow adapter and its junk. Exactly as you stated the casting is rough and porous. The fr*ggn' thing doesn't have the threaded hole for the vacuum fitting and its just butt ugly. I wasted my money on that spongy casting and then ordered a real one from Edelbrock (much nicer) and it comes complete with hardware and gaskets for like maybe $10 bucks more than that MAC thing. Don't get me wrong about MAC. Their exhaust system products are O.K., but I'm a little skeptical about their cast aluminum stuff. I got their diff cover and it looks like swiss cheese or something!
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