CT Engineering has developed a Supercharger Kit for K20Z3 (which also fits K20Z4) that increases power by approximately 65-70+ horsepower at the wheels. The supercharger uses an “Eaton-type” design that provides consistent boost and compresses the intake charge efficiently with a minimal increase in the intake air temperature. This combination provides almost instant boost that increases low and midrange torque for excellent throttle response.
The kit comes complete with cast aluminum supercharger manifolds, all mounting brackets, and all necessary hardware. The kit is completely "bolt-on", and requires no major modifications, so the car can easily be returned to stock.
Price: hmm around B$5,468.00 (+-)
source:ct-engineering