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Originally Posted by bbfirebird
From the looks of the short runner length, on a stock engine you'd probably see a drop in low-end torque and a slight gain in top-end HP. I wouldn't put this manifold on any truck that isn't running some kind of forced induction.
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My thoughts precisely. Im not sure how long the stock runners are, but those are defintely short. NA or not the manifold will breathe better up top, the question to me would be exactly how high would one need to rev the motor before this manifold hit its sweet spot.