Complete S-ported M90 supercharger includes:

• S-Ported M90 Supercharger
• Performance nose drive w/ 3.4" pulley
• Supercharger gasket
• O-Rings
• Throttle body gasket

S-porting is the process where Magnuson Products shaves the housings down and polishes the interior of the housing to create less restriction to air flow. Less restriction equals less friction and that means lower heat and faster air flow. Magnuson claims the S-port adds an additional 15-20 horsepower over and above any gains from the 3.4" pulley that comes with this unit. This means anywhere from 30-40 or more horsepower is possible for this swap alone.

Offered as a CORE EXCHANGE ONLY - you must return your original factory supercharger in GOOD, WORKING CONDITION with the same components as were shipped to you - i.e. the supercharger, any bypass valves or tubes, and the nose drive. The gaskets and o-rings are for installation and do not need to be returned. No defective, rattling, squeaking supercharger will be accepted.

Q: Where do I send my core return to?
A: Please Click here to fill out our core return form. Instructions are at the bottom. Please make sure to let us know when you have shipped your core by filling out this page.

APPLICATION NOTE: Fits 1997-2003 Pontiac Grand Prix GTP, 1998-2003 Buick Regal GS, 2004 Chevy Impala SS, and 2004 Chevy Monte Carlos SS all WITH FACTORY SUPERCHARGER ONLY.