Originally Posted by Mr.Squeeze

All rib set up's have slight belt slippage the only way to avoid this is to run a all cog set up.This means on the front of the bracket as well,witch is something I would not do with this system.As far as the impeller goes it does add power under the curve,and peak boost.One thing it does not do is spin the blower faster this can only be done by changing the pulleys.The Stillen 8 pound pulley is the same size as a vortech 3.12 pulley there 9 pound is around 2.80.

The Stillen Supercharger uses a big pulley on the backt his causes the blower to spin slower witch means boost comes in slower. I could show you a few dyno's from 350z's that use the same blower without the impeller.That have a better power band with more torque some with more peak power.All without the impeller.

We all know that Stillen made the kit around the carb tune.Vortech did the same thing with the 350z with the same unit.