Adding 10 Horsepower (or More!) for $100 (or Less!)
If you have a later-model truck with throttle-body fuel injection, several companies make filter assemblies that accept K&N air filters. We recently dyno-tested this Stillen Hi-Flow air cleaner on an ’88 Chevy C1500 with a 5.7L and registered a 5hp gain. Priced at about $100, these units are a bit more pricey than the traditional open-element because of the plastic housing.
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