Originally Posted by 1slow370

Ok on an itb or carb setup you can get longer or shorter stacks and ones with different tapers, like the throat part is different below the bellmouth, by changing the length of the throat you add or subtract from the runner length, this effects hiemholtz reasonance freaquency of the runner/stack assembly which shifts the point at which accoustic pressure helps ram air into the engine which tunes the power band. The reason jordo saw no gains was because the inlet on the factory airbox is not the choke point in our cars intake system. If his intake system were optimally designed everywhere else then he would have seen minor gains from this. And heres another hint, you can only suck so much air into a cylinder that csnt get all its exhaust out.

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