Most intakes make negligible gains under 6500rpm. I made low end gains with my intakes, but it could have been from my pulley's too. The stock boxes are very efficient down low. They choke up top. Now an M370 intake manifold will help you get what you are looking for.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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