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I do understand the theory/reasoning of why a cai harms gas mileage. The thing that I question is the increase in mileage reported on the highway with this particular set up. This has been stated by many people that did this mod on the focus forum. I hesitate to call it ram air. So is there a confirmation a positive pressure in the airbox give a simular effect to a low pressure turbo, with possible mileage gains? Also, if I read the second post correctly it would be best to have a heated positive pressure in the airbox, right?
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