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Spectre PerformanceLow-Profile AirboxUse this Spectre [www.spectreperformance.com; (800) 821-4868] low-profile airbox (PN 98699) to add power by feeding cold air into the engine. It takes up the same amount of space as a standard 14-inch air cleaner and uses a Spectre lifetime filter element. The airbox costs $169.99. Spectre offers several airbox designs, as well as custom ducting kits to fabricate cold-air systems or a remote-mount air filter setup. Sheetmetal small-block Ford valve covers are also new.