Underdrive pulleys
 

Does anyone know what the true whp from most of the kits runs on the underdrive pulley kits. I know that medieval has 5whp from their kit im lookin into getting their kit just to see how well my car responds to this mod

I think that the only kit on the market, other then SR motorsports. But those are really expensive.

I have the medieval waterpump pulley and alternator pulley put on not bad pretty easy install. Noticeable freeing up of hp. At higher rpms it is more responsive