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I have a 00 FRC, and I know they didn't put the LS6 in until 01, but when I had the LS1 manifold on my old 99 WS6 there was an EGR fitting in the top of the manifold that I had to plug when I took my emissions out.
This manifold I have now has no emissions fitting on it.
12573572 is the LS6 number, my 2000 Corvette is in the paint booth getting fresh paint or I would tell ya the number for the non EGR LS1 intake also. Yours is prolly LS1 just guessing by the year of your car and the LS6 not showing up in a vette till 01.
Ah alright, so probably have the LS1 then. I thought so... the car was bone stock when I bought it so I found it weird that it would have just an LS6 intake.