GReddy 2017+ Honda Civic SI Coupe Supreme SP Exhaust

GReddy is well-known for making performance parts that help drivers get more out of their vehicles. This Supreme SP cat-back exhaust system is a prime example, built specifically for the 2017-2020 Honda Civic SI Coupe. If you're looking to give your SI a more aggressive exhaust note and potentially free up a little power, this system is designed to do just that.

This isn't just about sound, though. The Supreme SP system is constructed from polished 304 stainless steel, which is strong and resists corrosion, meaning it's built to last. It features a dual muffler design with a straight-through muffler layout, which helps reduce backpressure compared to the stock system. This improved flow can lead to a more responsive feel, especially when you're accelerating. The piping diameter is 70mm, stepping up from the factory size to help with exhaust gas flow. It also includes a polished stainless steel tip for a clean, finished look under the rear bumper.

When installing this cat-back system, you'll find it's designed as a direct bolt-on replacement for your factory exhaust. This means no welding or cutting is typically required, making the installation process more straightforward. You'll get a deeper, sportier exhaust tone that really lets the engine's character come through, without being overly raspy or droney at cruising speeds. This system is a solid choice for SI owners looking for a well-built exhaust that balances performance and sound.