GFB lightweight pulley kits are made from aircraft-grade 6061-T6 aluminum and offer faster acceleration through significant weight reduction on the crankshaft. The effect is similar to a lighter flywheel, and the car feels more lively and willing to rev.
This kit includes the crank, alternator and water pump pulleys.
Stock Crank Pulley : 4.89lb
GFB Crank Pulley : .75lb
Stock Water Pump Pulley : 1lb
GFB Water Pump Pulley : .53lb
Stock Alternator Pulley : .44lb
GFB Alternator Pulley : .18lb
That is almost 5lbs of rotational mass lost.