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If i recall Mightymouse made close to 1000rwhp on a stock ls6 didnt he?
LS6 intake is different. It's for a cathedral head and it's a one piece design. Not sure about the LS3. I suspect the comment about not making over 1K hp is because of the heads unless he intends on using an aftermarket LS3 style head like the ones from Mast or PI.