STILLEN 400336 Underdrive Performance Lightweight Pulley Set - 03-06 350Z / G35 Sedan / 03-07 G35 Coupe / 03-07.5 FX35 Complete Underdrive Pulley Set; Includes 3 Pulleys - Crank, Alternator, Idler OEM Pulley Weight: 7.56 lbs.; STILLEN Pulley Weight: 1.91 lbs. Approximate Underdrive: 20%; Shorter Belt Required and Sold Separately Not for 2007 Vehicles Without Idler Pulley; Single Throttle Body Engines Only