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Increase Horsepower. Boosting your Wrangler engine’s horsepower by anywhere from 7 to 12 horses is easy with BBK’s 62mm Throttle Body from the company’s Power-Plus Series performance parts. With a big 62mm inlet this throttle body sucks in an ample flow of cold dense air that powers up your Jeep’s 4.0L engine strongly. Besides boosting aspiration this component is precision CNC machined out of tough rust-proof 356 aluminum alloy that will stand up to years of hard-charging off-road adventure. Quality Construction. The 62mm Throttle Body by BBK is a performance part made from 356 aluminum alloy cast and then CNC machined to precise tolerances. Features include die-stamped throttle linkages double-sealed bearings and an O-ringed throttle shaft. Designed for high airflow this part includes a multi-port injection Mpi style and is built to exceed stock strength and quality standards. Horsepower gains range from 7 to 12 HP varying by model and application. Application. This BBK Power Plus Series 62mm Throttle Body is specifically designed to fit the 1991-2003 Wrangler YJ and TJ models equipped with a 4.0L engine.