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The headers are the bottleneck. Think about it, you squeezing air down, and expelling thru manifolds as opposed to 1 7/8 headers. I say another 25/35+ hp
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2001 ws6, 40k miles, Ls3 416 stroker, short block built by PER the rest by me. LPE Ls3 heads milled to 12-1 comp, FAST 102, NW 102, kooks 2", dual DMH cutouts, Magnaflow C/B, BTR cam + springs. Full UMI suspension.
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