The factory blower pulley includes the hub, and is pressed onto the shaft - which makes quick, trackside changes impossible. The Steeda Interchangeable Pully System (pat. pend.), you replace the factory pully with our precisely machined hub, then attach your choice of pulleys with the allen head set screws provided. Running a larger pulley on the street saves fuel, while the 2.80" bumps the boost for a noticable performance gain.
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