Protect your engine. Modifications can compromise your stock harmonic balancer. Install a Fluidampr performance damper early for best durability. Superior viscous damper design controls harmful torsional vibration across the entire rpm range. Reduce wear on engine components. Reduce risk of crankshaft failure. Improve timing. Unleash lost torque and horsepower. Precision CNC machined and balanced high-grade steel components. Corrosion resistant black zinc finish with engraved timing marks. No maintenance required. NOTE: 10% underdrive water pump pulley designed to help prevent cavitation and overheating at high rpm. Recommended GATES pn K040335 or 34" equivalent serpentine belt required. AC and power steeting belt remains stock. NOTE: Retains stock tone wheel. NOTE: Includes 4x 12.9 grade M6x16mm bolts. Trusted by leading engine builders worldwide. SFI 18.1 certified. Made in USA.