Used in my LS3 swap. I assembled my 4" air intake using Specter air intake parts, but none of them had a vacuum port. It comes with several different sized connectors to suit all needs BUT THE PIECE SAWS SUPPLIED ARE RUBBISH. I used my own. They are thin at best, I read the comments on this but didn't believe them. So if you don't have a hole saw handy, get one. Other than that, GREAT product.
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