Stillen Underdrive Pulley - Review/Pics/Dyno/Vid

1slow370

I'm sorry if you don't understand these things but if the crank is putting out 20% less belt speed and you install a 20% overdriven pulley on a supercharger they cancel out and it like having stock pulley only you gain the 5hp from slowing down the accessories. More heat? the blower won't be turning even 1rpm faster than would be with stock pulleys. Its called not wasting a $250 underdrive pulley. You must be a turbo guy.

Besides that they use a smaller pulley to go up in stages with the power so along with more heat there's a lot more air but that's irrelavent to my earlier post.