Getting more air into your engine and more exhaust out is the key to a performance motor. That’s where exhaust headers is significant as the first revenue of an exhaust system. Exhaust performance headers manipulate the air flow with the performance-robbing exhaust manifold that came with your car. Headers provide each cylinder with its own mini exhaust pipe, which means exhaust headers prevent interference among cylinders; thus, the backpressure that occurs in common exhaust manifolds. When cylinders don’t have to fight with each other to expel their exhaust, they can put more power through the wheels, pushing the vehicle. Combining with a high performance cold air intake, and a cat-back exhaust system, a header system removes all restrictions of your engine, then, it is able to perform at its full potentialItem Included: 1 X Exhaust HeaderHardware as Shown in the Picture AboveProduct Specifics:Color: MetallicFinish: Semi-PolishedMaterial: T304 Stainless SteelInlet / Outlet Diameter: Inlet: 1 3/4″ Primary / Outlet: 2″ CollectorStyle: 4-2-1 Long Tube HeaderMounting Style: Clamp-OnCompatible with:Honda Civic SI 2006-2011Notes:Professional Installation is Highly RecommendedInstallation Instruction is NOT Included Compatible with 2006-2011 Honda Civic SI Inlet: 1.75 inch Ports Outlet: 2.00 inch Flange End 4-2-1 Design 16-Gauge Pipe Thickness 3/8 inch Thick Flanges 304 Stainless Steel Made of high-grade T304 Stainless Steel for durability, rust resistance, and longevity. Semi-Polished to resist corrosion and provide a sleek appearance. Designed to improve exhaust gas flow, reducing back pressure. Boosts horsepower and torque for better acceleration and overall performance. Enhances exhaust tone for a deeper and sportier sound without excessive noise. Direct bolt-on installation, no welding or modifications required