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I am at 13 psi with Meth and the LS9 cam and a whipple. Did not dyno but I am close to or over 700rwhp. I put on a 8 rib kit last year and it does great. 6 ribs did not like 13 psi. I am using a 3.625 pulley with IW 10% overdrive damper. Stock clutch is doing fine but I don't drag race it. It is a real fun car to drive.
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