It will lose power and torque at lower rpms just like other manifolds of this type. Good threads on this manifold in other boards. Kudos for BTR delivering this quality manifold at a great price point For your average bolt on parts guy, ask yourself this question; How much time do I spend at 6000-8000 rpms in the way I drive my car now? Also note that you have to have the valvetrain for those rpms too. For 80% of us it is hard to beat the factory manifold.
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