On a Dynojet, I would guestimate 290-295 hp. He's still running stock cats with a cbe, drop-ins and maf tubes. 6mt is correct and the important difference is the Delta between your baseline and post mods dyno. If the average Z is doing between 270-280hp on a dynojet for their baseline, I would agree anything over 300 may be optimistic, but not in the realm of impossibility.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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