This pulley was almost three times as expensive than any billet aluminum pulley you can get from PERRIN, COBB, etc. There is far more R&D that has gone into the Fluidamper pulley as well. Drag racers support these pulleys over solid aluminum because they put less stress on engine internals, especially when running the engine at it's limits. Zero loss in power tranfer, and a smooth running engine. Worth the extra cabbage!