Underdrive Pulley Questions

[Ghostrider 310]

UP can be felt as soon as you accelerate, I wouldn't put gain numbers on it but you can feel the difference easily, that usually isn't the case with other 986 mods where you aren't sure if it just sounds faster.

As for cost, here's the one I had, might as well replace the roller bearings and you need a new belt so add about 40 extra.

RSS Underdrive Pulleys - RSS

[Meir]

or you can order it with the type of belt you need, here:
RSS Under Drive Pulley for Porsche Boxster, Cayman, Carrera, Targa

[The Radium King]

This means that the effort (read hp) to turn the pump increases as you turn it faster

are you sure about that?