Description: This exhaust manifold for the 2006-2011 Honda Civic SI 4 Cylinder Engine were designed to combine the exhaust gasses from each of the cylinders quickly with a manifold that was cost effective to produce. Our 4-2-1 Tri-Y off-road racing headers are designed to allow the exhaust gasses to flow more freely from each cylinder and combine in a more efficient manner. Tubing has been optimized for the 2.0L engine. This creates a reduction in cylinder backpressure and improved exhaust gas velocity. These improvements free up lost horsepower and torque. An added benefit is a more performance oriented exhaust sound. Made of high quality T-201 stainless steel materialTIG welded CNC machine flangeMetal gasket included4-2-1 Racing designIncrease high flow air, instantly gain 10 to 15 Hp.Product Content: * One Exhaust Header with Gaskets and bolts * Hardwares such as Gaskets and Bolts as Shown in the Picture Above

Year	Make	Model	Trim	Engine
2011	Honda	Civic	Base Sedan 4-Door	1.3L 1339CC l4 FULL HYBRID EV-GAS (FHEV) SOHC Naturally Aspirated
2011	Honda	Civic	DX-G Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2011	Honda	Civic	DX-G Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2011	Honda	Civic	DX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2011	Honda	Civic	DX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2011	Honda	Civic	EX-L Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2011	Honda	Civic	EX-L Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2011	Honda	Civic	EX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2011	Honda	Civic	EX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2011	Honda	Civic	GX Sedan 4-Door	1.8L 1799CC l4 CNG SOHC Naturally Aspirated
2011	Honda	Civic	Hybrid-L Sedan 4-Door	1.3L 1339CC l4 FULL HYBRID EV-GAS (FHEV) SOHC Naturally Aspirated
2011	Honda	Civic	Hybrid Sedan 4-Door	1.3L 1339CC l4 FULL HYBRID EV-GAS (FHEV) SOHC Naturally Aspirated
2011	Honda	Civic	LX-S Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2011	Honda	Civic	LX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2011	Honda	Civic	LX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2011	Honda	Civic	Si Coupe 2-Door	2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
2011	Honda	Civic	Si Sedan 4-Door	2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
2010	Honda	Civic	DX-G Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2010	Honda	Civic	DX-G Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2010	Honda	Civic	DX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2010	Honda	Civic	DX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2010	Honda	Civic	EX-L	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2010	Honda	Civic	EX-L Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2010	Honda	Civic	EX-L Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2010	Honda	Civic	EX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2010	Honda	Civic	EX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2010	Honda	Civic	GX Sedan 4-Door	1.8L 1799CC l4 CNG SOHC Naturally Aspirated
2010	Honda	Civic	Hybrid-L Sedan 4-Door	1.3L 1339CC l4 FULL HYBRID EV-GAS (FHEV) SOHC Naturally Aspirated
2010	Honda	Civic	Hybrid Sedan 4-Door	1.3L 1339CC l4 FULL HYBRID EV-GAS (FHEV) SOHC Naturally Aspirated
2010	Honda	Civic	LX-S Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2010	Honda	Civic	LX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2010	Honda	Civic	LX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2010	Honda	Civic	Si Coupe 2-Door	2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
2010	Honda	Civic	Si Sedan 4-Door	2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
2010	Honda	Civic	Sport Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	DX-G Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	DX-G Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	DX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	DX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	EX-L	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	EX-L Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	EX-L Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	EX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	EX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	GX Sedan 4-Door	1.8L 1799CC l4 CNG SOHC Naturally Aspirated
2009	Honda	Civic	Hybrid-L Sedan 4-Door	1.3L 1339CC l4 FULL HYBRID EV-GAS (FHEV) SOHC Naturally Aspirated
2009	Honda	Civic	Hybrid Sedan 4-Door	1.3L 1339CC l4 FULL HYBRID EV-GAS (FHEV) SOHC Naturally Aspirated
2009	Honda	Civic	LX-S Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	LX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	LX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2009	Honda	Civic	Si Coupe 2-Door	2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
2009	Honda	Civic	Si Sedan 4-Door	2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
2009	Honda	Civic	Sport Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2008	Honda	Civic	DX-G Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2008	Honda	Civic	DX-G Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2008	Honda	Civic	DX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2008	Honda	Civic	DX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2008	Honda	Civic	EX-L Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2008	Honda	Civic	EX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2008	Honda	Civic	EX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2008	Honda	Civic	GX Sedan 4-Door	1.8L 1799CC l4 CNG SOHC Naturally Aspirated
2008	Honda	Civic	Hybrid Sedan 4-Door	1.3L 1339CC l4 FULL HYBRID EV-GAS (FHEV) SOHC Naturally Aspirated
2008	Honda	Civic	LX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2008	Honda	Civic	LX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2008	Honda	Civic	MUGEN Si Sedan 4-Door	2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
2008	Honda	Civic	Si Coupe 2-Door	2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
2008	Honda	Civic	Si Sedan 4-Door	2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
2007	Honda	Civic	DX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2007	Honda	Civic	DX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2007	Honda	Civic	EX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2007	Honda	Civic	EXS Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2007	Honda	Civic	EX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2007	Honda	Civic	GX Sedan 4-Door	1.8L 1799CC l4 CNG SOHC Naturally Aspirated
2007	Honda	Civic	Hybrid Sedan 4-Door	1.3L 1339CC l4 FULL HYBRID EV-GAS (FHEV) SOHC Naturally Aspirated
2007	Honda	Civic	LX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2007	Honda	Civic	LXS Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2007	Honda	Civic	LX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2007	Honda	Civic	Si Coupe 2-Door	2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
2007	Honda	Civic	Si Sedan 4-Door	2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
2006	Honda	Civic	DX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2006	Honda	Civic	DX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2006	Honda	Civic	EX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2006	Honda	Civic	EXS Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2006	Honda	Civic	EX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2006	Honda	Civic	GX Sedan 4-Door	1.8L 1799CC l4 CNG SOHC Naturally Aspirated
2006	Honda	Civic	Hybrid Sedan 4-Door	1.3L 1339CC l4 FULL HYBRID EV-GAS (FHEV) SOHC Naturally Aspirated
2006	Honda	Civic	LX Coupe 2-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2006	Honda	Civic	LXS Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2006	Honda	Civic	LX Sedan 4-Door	1.8L 1799CC l4 GAS SOHC Naturally Aspirated
2006	Honda	Civic	Si Coupe 2-Door	2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated