The C1-11 will deliver â€œhorsepower you can feelâ€ with instant throttle response, improved mid range acceleration, and increased top end performance. The R&D Monster Wheel replaces the stock wheels inefficient 5 blade design with an all new modern low profile, high flow, 11 blade high tech design. The R&D Monster Wheel will deliver an increase of 3-3.5 pounds of boost pressure with a 1.5-2.0 pound per minute airflow gain. The R&D C1-11 Monster Wheel fits directly into the O.E.M. stock compressor housing for a â€œno modificationsâ€ bolt on and go part. The C1-11 Monster works with the OEM intercooler, OEM fuel injectors, OEM ignition system and the R&D Intake CFM Kit. Kit performs well on 91 octane pump gasoline. Boost rated 7/8.5 P.S.I. (7 @ 7500 and 8.5 @ 7700) Horsepower increases were professionally documented by MOTEC AUSTRALIA.