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Do not waste your time with shorty headers, best bet is to remove the cats but then in " The People's Republic of California" you would be in violation. If you go Lt's your in violation even if you go with the $green cats$. If you really need your warranty then leave it stock. Your biggest gains will be from the Lt's and Cold air kits combos, and more when properly tuned.
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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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