UD pulleys
 

I plan on picking up an underdrive pulley kit soon and i was wondering if I should judt get the crank pulley or go with a 2 or 3 pc kit. How much more power do u get with the extra's? Is their an advantage to have them or do they cause problems with your a/c and other things

I would buy both. I have mine and I am pushing two 12 inch subs with no problem,