Upgr8 U8501-0704 High Performance Black Cold Air Intake System Kit with Green Air Filter (No Fit 2.0L Turbo Engine) Applications: 1999-2005 Volkswagen Golf / Jetta Model with 1.8T Turbo / 2.0L NA L4 Engine Direct bolt on design Increase 6-12 hosepower and 8%-10% power torque Improve performance and gas mileage Instruction is NOT included. Professional installation is highly recommended!