Exhaust Header Fit for 2006-2011 Honda Civic Si 2.0L K20Z3 4-2-1

Performance exhaust header designed for compatible 2006-2011 Honda Civic Si models equipped with the 2.0L K20Z3 4-cylinder engine. Featuring a 4-2-1 racing-style layout, 1-3/4 in inlet ports, a 2 in flange-end outlet, mandrel-bent tubing, TIG-welded polished stainless steel construction, and thick steel flanges, this header is designed for the specified Civic Si exhaust configuration.

Vehicle Fitment

• Fit for 2006 Honda Civic Si 2.0L K20Z3
• Fit for 2007 Honda Civic Si 2.0L K20Z3
• Fit for 2008 Honda Civic Si 2.0L K20Z3
• Fit for 2009 Honda Civic Si 2.0L K20Z3
• Fit for 2010 Honda Civic Si 2.0L K20Z3
• Fit for 2011 Honda Civic Si 2.0L K20Z3
• Compatible with listed FG2 / FA5 Civic Si applications
• Fits 2.0L K20Z3 4-Cylinder Engine Applications Only
• Please verify your exact model year, Si trim, engine code, chassis code, cylinder-head flange pattern, O2 sensor configuration, and downstream exhaust connection before purchasing
• Modified exhaust systems, engine swaps, aftermarket mid-pipes, or other non-original components may affect installation compatibility

Product Highlights

• Civic Si K20Z3 Compatibility – Designed specifically for compatible 2006-2011 Honda Civic Si models equipped with the 2.0L K20Z3 engine
• 4-2-1 Racing Design – Four primary exhaust paths merge into two sections before combining into a single outlet
• 1-3/4 in Inlet Ports – Features the specified 1.75 in inlet port dimensions
• 2 in Outlet – Uses a 2 in flange-end outlet for connection to a compatible downstream exhaust system
• Mandrel-Bent Tubing – Mandrel-bent construction helps maintain smooth tubing transitions through the header
• Polished Stainless Steel – Stainless steel construction with a polished finish provides durability and a clean performance appearance
• TIG-Welded Construction – TIG-welded assembly supports strength throughout the header system
• Thick Steel Flanges – Heavy flange construction supports secure mounting at compatible connection points
• Gaskets Included – Supplied with gaskets for installation; original vehicle bolts are reused as specified

Product Specifications

• Product Type: Exhaust Header
• Vehicle Make: Honda
• Vehicle Model: Civic Si
• Vehicle Years: 2006-2011
• Engine: 2.0L
• Engine Code: K20Z3
• Engine Configuration: 4-Cylinder
• Listed Chassis: FG2 / FA5
• Header Configuration: 4-2-1
• Inlet Port Size: 1-3/4 in
• Outlet Size: 2 in
• Material: Stainless Steel
• Tube Construction: Mandrel-Bent
• Welding: TIG-Welded
• Finish: Polished
• Flanges: Thick Steel Flanges

Package Includes

• 1 × Exhaust Header System
• Gaskets

Installation Notes

• Please verify your exact vehicle year, Civic Si trim, engine code, and chassis before purchasing
• Designed for compatible 2006-2011 Honda Civic Si 2.0L K20Z3 applications
• Confirm cylinder-head flange alignment, gasket seating, O2 sensor locations, exhaust routing, and downstream connection before installation
• Gaskets are included; reuse the original vehicle bolts as specified
• Test-fit the header and verify surrounding clearance before final tightening
• Modified mid-pipes, cat-back systems, previous exhaust repairs, or other non-original components may affect installation
• Professional installation is recommended