Really? I definitely feel a difference between 14 and 17 becase I run a profec e01, mine can be switched on the fly or automatically based on speed, its definitely noticeable. You guys are forgetting CAMS and also Intake chambers would make a huge difference. CAMS can only make power in a certain range, CAMS can only do so much for power because there IS a sweet spot for CAMS for power range. Same with the stock intake manifolds and runners. YOu can easily max out the chamber s and just can't flow any more.... I believe this is the biggest affect....
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