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draw air from the bottom of the engine bay rather than at the top
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Thats how they do it with a lot of the jap imports. Through into the wheel well is also common, but i imagine dirty.
They actually make an attachement that you can plumb in that has a valve that opens if the intake sucks water. Pobably useful if used at the nationals
Is there room next to the radiator?
RE: mafless - This helps reduce the impact of leaks in the intake as well since MAP sensors work off intake pressure instead of air flow like the MAF (i am assuming thats how it is done, i have no experience with the LS engines yet). I think you would struggle to notice any performance increase mafless on a stock engine as there are more restrictive parts in the system. Some MAF sensors have a filter screen on the front that can create some restriction, i have known people to remove these (dont know if this is on the LS1).