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Smaller diameter pulley for installation on M112 superchargers. By installing the smaller pulley the supercharger makes more RPM resulting in more airflow and boost which can be used to increase horsepower.
This upgrade pulley is available in a 6%(type 1) or 10%(type 2) version. For the 10% version the supercharger snout needs to be machined to get it to fit.
With a 6% pulley horsepower goes up with 25hp, for the 10% version this goes up to 40hp. Combined with a good ECU tune these gains get even better!
Suited for the following models with 4.0 and 4.2 V8 supercharged engine: