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I will paypal you a whole dollar to to demonstrateThere is one alternative to avoid having to choose through all of this, run it open with no manifolds or headers. It will sound amazing, just remember to put some heat wrap around your plug wires.
Is the factory setup "hurting" your power? Probably. Enough that you'd notice a difference if that was the only part you replaced? Probably not.
I will paypal you a whole dollar to to demonstrate
I gues davidsfarm disproved the whole backpressure thing lol. Now on a certain 454 vortec lolImpossible, everyone "knows" engines "need a little backpressure" to run lol.