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Air intake

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Each snorkel only needs to feed half the engine. Some people run quite happily 2.5" diameter for entire of 4.6. Depends how often you drive at max revs (and therefore max air required). 2.5" inch is probably enough 4" is massive.

I suppose ideally they would be the same length to be the same resistance but as long as the engine is getting air should be fine. (exhaust headers need to be the same length so cylinders expel gas into the main pipe sequentially) intakes just need air. I wouldn't make one freakish long compared to the other but shouldn't matter too much. Filters should be the same type though.

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