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Tremec can handle the power but it's costly and the trans is bulky requiring the tunnel mods as you mentioned. I'd have a hard time hacking my tunnel up for that myself. Also, I stand corrected, the gto is a .57 final

Aj, depends on what Tremec you use. There are other ratios than that in o.d. at least. My 04 GTO has a .64 or .67 final with a 3.4 rear end gear. (Same ratios and trans for that matter as same year Z06 btw.)