Whats the difference in specs and performance between the Ultra S and the
Ultra Sc Pulley. Can you use the stock belt on these or do it comes with the belts???? Can somebody help me out? Thax

 

https://acurazine.com/forums/showthr...ghlight=pulley

 

look in Off Topic for thread on pulley
or look at makers website or use search feature on azine for all you need to know about radio watt limits and what pulley is for you
All we need is the crank pulley, the others dont serve enough to merit install

 

Ultra S = underdrive pulley - suitable for all vehicles without a stereo system over 600 watts RMS or supercharger; requires new belt.

Ultra Sc = stock size pulley - suitable for all vehicles but generally for vehicles with stereo system over 600 watts RMS or supercharger system; uses stock size belt.

 

Thanks for the replies it really help. Question answered.

 

I am now going for the Ultra Sc due to having a sound system.