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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
If the max airflow is close to pegging the stock MAF sensor then its worth increasing the size and retuning. Otherwise, the gains aren't worth the cost and effort. Unless you've installed high flow heads or a blower you don't need to be concerned.
Using a larger than stock housing would result in minimal (probably not measurable) reduction in flow restriction that might increase fuel economy and max power. Increasing the diameter would require retuning and in my opinion not worth the cost. The money would be better spent on a high flow, high filtration air filter.