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hell, i got a C5 intake that is not a Ls6 sitting in my garage right now. They just don't have the EGR provision in the front of the manifold like ours....but it's still the crappy old LS1 intake
Only way to be positive is to be able to look at the bottom of the intake. Can you look at the bottom of it? In the pic below, the ls6 is on the right, and ls1 is on the left