At this point, I wonder what can be extracted with some more aggressive exhaust cams. And would it be worth the cost and effort. At that point there isn't much more to do than increase compression and displacement. Spinning the motor even more is expensive and at what point will VVEL crap the bed? That oil pump is on the ragged edge at 8k already.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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