I'm thinking about getting the UR pulley but I remember reading that AUTO get more HP/TQ with all 3 pulleys (crank/accesssary pulleys) instead of just the crank. Is this true or will just having the crank be enough?

 

Do the additional pullies further increase the underdrive, or are they just lightened? If they're just lightened, forget about them. They'll do nothing, so to answer your question, the crank pulley is all you'd want for the underdrive ability.

 

for AUTO it's really hard to install the CRANK PULLEY.......need special tool for that...