GReddy 06-11 Honda Civic Si 63.5mm Supreme SP Cat-Back Exhaust

This GReddy Supreme SP cat-back exhaust system is made for the 2006-2011 Honda Civic Si. It replaces the factory exhaust from the catalytic converter back, improving exhaust flow and giving your Si a more aggressive sound. The system uses 63.5mm (2.5 inch) diameter piping, which is larger than stock to help your engine breathe easier.

GReddy is known for making well-built exhaust components, and this Supreme SP system is no exception. It's constructed from stainless steel to resist corrosion and ensure it holds up over time. The muffler design is tuned to provide a deeper, sportier tone without being overly loud or droney for daily driving. Installation is designed to be a direct bolt-on replacement for the factory system, meaning no welding or cutting is typically required, though you should always refer to the manufacturer's instructions for specific details.

When installing a cat-back exhaust, you're often looking for a combination of improved performance and a more satisfying sound. This GReddy system aims to deliver both for your Civic Si. It's a solid option if you're looking to enhance the driving experience of your Si with a more performance-oriented exhaust note and potentially a slight improvement in throttle response due to the increased pipe diameter.