Originally posted by ct:
it's called an under drive pulley
I thought it was called "Tru-Power Pulley"AEM
Tru- Power- pulleys increase power by reducing Our lightweight pulleys reduce rotating weight and are slightly oversized to maximize efficiency, which nets more horsepower at the wheels.We guarantee our pulleys' belt tooth profiles to match O.E. specifications, eliminating any chance of premature belt wear. Comprehensive installation instructions, replacement belts and AEM
decals are included in every kit.
Tru-Power- Pulley Kits are two-pulley systems. However, for vehicles with pressed-on power steering pump and/or air conditioning pulleys, AEM
manufactures a single pulley system.
Vehicle manufacturers have thoroughly investigated the use of torsional vibration dampeners and conclude that their use significantly reduces NVH (noise, vibration and harshness). Furthermore, manufacturer and independent research shows that torsional vibration dampeners are critical to engine life where long-term use is intended. Removing the torsional vibration dampener from an engine can be highly detrimental to its long-term operation! http://www.aempower.com/pulley.htm