5th is not "overdriving our engine" (1:1) As long as your motor can pull through the gear, it's not any different on the engine than doing 30 in 1st gear. 5th and 6th just aren't as robust as the other gears.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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