Steeda S197 Mustang GT Underdrive Pulleys
Steeda Underdrive pulleys reduce belt-driven accessory speed by approximately 25%, reducing parasitic engine load. The manufacturer reports up to 10 hp and potential fuel-economy improvement.
The crank pulley is a one-piece nodular-iron design with moulded rubber torsional damping, not a piggyback part attached over the original. Rubber is selected for vibration absorption and underbonnet temperatures. Steeda describes Ford technical-data-based development and SFI approval.
Instructions and videos
Related vehicles
- Mustang S197 GT 4.6 V8, 2005–2010
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