The numbers given has me thinking they are basing this at the crank. either way, 450 hp at the crank is around 400whp. It's not out of the realm of possibility. With full boltons, including flywheel, these cars are getting close to or right around 400 on the crank. Add these exhaust cams and some VVEL adjustments, this seems within reason (maybe not financially).
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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