GReddy 2017+ Honda Civic SI Sedan Supreme SP Exhaust

If you're looking to give your 2017-2020 Honda Civic SI Sedan a more aggressive sound and a noticeable bump in performance, the GReddy Supreme SP Cat-Back Exhaust system is a solid choice. This system is designed specifically for the SI Sedan model, meaning it bolts right up to your existing catalytic converter and factory mounting points, making installation straightforward for a direct fit.

The Supreme SP system is constructed from well-built 304 stainless steel, which is known for its strength and resistance to corrosion, ensuring this exhaust will hold up well over time. GReddy's design focuses on optimizing exhaust flow, which helps the engine breathe more freely. This improved flow can lead to a more responsive throttle and a deeper, more satisfying exhaust note that's noticeable without being overly obnoxious. The piping diameter is carefully chosen to balance performance gains with maintaining good low-end torque, so you get an improved driving experience across the board.

When installing this cat-back system, you'll typically reuse some of your factory exhaust hangers and hardware, though it's always a good idea to check the included hardware list to be sure. The result is a cleaner look under the car and a sound that really complements the sporty nature of the Civic SI. This exhaust is a popular upgrade for owners looking to enhance both the sound and feel of their turbocharged four-cylinder engine.