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changing the length of the intake changes your hp gain in certain rpms. generally shorter tube helps out in the lower area and longer tube is opposite. but its only so long before theres no gains anywhere at all. (ive tested this myself on the dyno)
also i said generally because theres other factors like where its drawing the air from. if you have a short ram your going to be absorbing hot engine bay air so you could just lose power all around.
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