The Tsudo Stainless 4-2-1 Hi-Flow Headers are a top upgrade for FA5 FG2 2006-2011 Honda Civic Si models with K20 motors. Featuring an equal-length Y-pipe, they boost mid-range power, throttle response, torque, and horsepower. Made from durable T-304 stainless steel with a polished finish, they include a hi-flow catted racing catalytic converter and CNC mandrel-bent 2.75" outlets for maximum exhaust flow. Compatible with stock and aftermarket exhaust systems.

• Fits 2006-2011 Honda Civic Si (K20 motor)
• Equal-length Y-pipe for improved power and throttle response
• 4-2-1 design maximizes torque and horsepower
• Durable T-304 stainless steel construction
• Easy bolt-on installation, no welding needed
• Includes installation hardware and free Tsudo