HKS Sport Exhaust Civic Si (1988-1991) Infiniti Injen has seen gains of

Injen has seen gains of over 14 HP and 17 ft/lbs of torque

The PERRIN Blow Off Valve solves this problem with a proper seal as well as being fully adjustable

PERRIN intakes are constructed from aluminum tubing

each order receives two arms

Many of the other Pitch Mount Stops on the market use a much harder Urethane

HKS Sport Exhaust Civic Si (1988-1991) Infiniti Injen has seen gains ofThis HKS Sport Exhaust System for the 1988 1991 Honda Civic Si is designed to reduce back pressure and increase exhaust flow for greater peak power and a broader torque band. Each Sport Exhaust application utilizes a specific muffler design and shape along with the appropriate piping diameter to maintain low end torque while maximizing high end horsepower. Features: Piping Diameter: 50mm Tip Diameter: 60mm Tip Style: R 2