K&N's Fuel Injection Performance Kit (FIPK) dramatically reduces intake restriction and allows more air for more usable power and torque throughout the engine's RPM range. Gains of up to 14 hp are common. Easy installation with common hand tools. K&N part number 1997-2000 C5: KN 57-3020 K&N part number 2001-2004 C5: KN 57-3035 K&N part number 2001-2004 Z06: KN 63-1050