HKS 88-91 Honda Civic Si Hatchback Sport Exhaust

This HKS cat-back exhaust system is made for the 1988-1991 Honda Civic Si hatchback. It replaces the factory exhaust from the catalytic converter back, including the muffler and tailpipe. This system is designed to offer a more aggressive sound and improved exhaust flow compared to the stock setup, giving your Civic Si a sportier feel and a more noticeable exhaust note.

Constructed from durable SUS304 stainless steel, this exhaust is built to resist corrosion and withstand the rigors of daily driving. The piping diameter is optimized for the B16A engine found in the Si model, helping to reduce backpressure and allow the engine to breathe more freely. This can lead to a slight improvement in throttle response and a more engaging driving experience. The muffler design is tuned to produce a deep, sporty tone without being overly loud or droney at cruising speeds, aiming for a balance between performance sound and daily drivability.

Installation of this cat-back system typically involves unbolting the old exhaust and bolting in the new HKS components. It's designed as a direct replacement for the factory exhaust, meaning no welding or cutting is usually required, though always refer to the manufacturer's instructions for specific details. This system is a popular choice for enthusiasts looking to enhance the sound and performance of their classic Civic Si hatchback.