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the real benefit to the newer LS1 with the LS6 intake comes in the form of the greater Torque...I know the intake is not the only difference between the 97-00 LS1 and the 01-04 LS1, but what are the chances some or all of the nice boost in the torque rating will come long with the LS6 manifold on a pre-01 LS1?
I think a 8-10rwhp is more the norm. I did MAC mid-lengths with cats at the same time as the LS6 intake on my 2000 Z28 and netted 30rwhp. The intake swap was one of the easiest mod installs I've done on the LSx engines.