88 89 90 91 Honda Civic CRX Si EX 1.6 L4 GREEN Piping Cold Air Intake System Kit with Red Filter For 88 89 90 91 Honda Civic CRX Si EX 1.6 L4 Fits Automatic & Manual Transmission This Cold air intake kit will increase 7-10% of Horsepower and 5-8% of Torque It's the ultimate performance Cold Air intake Kit with higher explosive horsepower output Easy to install and easy to fit with simple tools (A General Installation instruction is included)