SS_Firehawk

Jcosta79 did a great job explaining it. Regarding that M370 intake manifold, the reason why it improves low, mid, and mid high rpm's is because the intake runners are longer, this improves torque. The shorter runners on the stock manifold benefit high in the rpm range. Even at our engines power band, the shorter runners don't have much benefit in high rpm power over the longer intake runners when both are properly tuned. The concept is very similar to headers.

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