Some of the specs:

• Power and torque gains throughout the power-band!
• Stock-sized main crank pulley (no under-drive related issues)
• CAD-Designed, billet aircraft aluminum construction (T6061)
• Metal sleeve on main crank pulley for a positive seal
• Weighs in at 2.35 lbs. versus 6.17 lbs. factory pulley!
• Fully balanced, super light, and super strong!
• Aircraft grade aluminum construction utilizing strict ISO 9001 manufacturing standards
• AMS laser-etched logo and anodized black for longevity/durability and a stealth stock look
• AMS pulleys have been used for years on highly built VG and VQ powerplants!
  
  To view the installation guide, CLICK HERE!
  Attached are the before and after dyno results with the AMS crank pulley. It smoothed out the curve a bit, and while the PEAK gains were very small, at a couple RPM points it gained 5 to 20 wheel horsepower. So, it's not a bad bang-for-the-buck modification!