Dinan's lightweight billet aluminum crankshaft pulleys under-drive each of the accessories by 13% for street applications or 16% for the track, reducing parasitic drag on the engine for increased  horsepower and torque. The Dinan underdrive pulleys retain the factory harmonic crankshaft damper, eliminating vibration that might otherwise damage the crankshaft.

The kits include all of the necessary mounting hardware, lightweight pulley and shorter belts.

Available September, 2008

13% Underdrive Pulley - Street Applications

       +6 hp@ 8000 rpm
       +4 lb-ft torque @ 8000 rpm

16% Underdrive Pulley - Track Applications

       +8 hp@ 8000 rpm
       +5 lb-ft torque @ 8000 rpm