About DC Sports Polished Stainless Steel Headers DC Sports headers are made of 100% T-304-stainless steel, including the flanges, eliminating any chance of rust. Our DC Sports polished stainless-steel headers feature hand TIG welds at the flanges, and our brushed stainless-steel headers feature machine MIG welds at the flanges that foster a tooled, custom-fabricated look. * Every system is dyno-tested for maximum performance
* CAD-rendered, race-inspired 4-into-1 design emphasizes top-end power for extreme racing applications
* 100% 304 Stainless steel construction including the flanges.
* CNC mandrel bends with robotically-welded fittings deliver perfect fit
* CNC-machined and threaded flanges and O-ring seals eliminate leaks
* Equal length primary piping ensures optimum tuning of systems for more power across rpm range
* Unique merge collector ensures smooth exhaust gas flow and increases ground clearance
* All systems are C.A.R.B. exempt or pending C.A.R.B. exemption
* Includes comprehensive instructions and all necessary hardware This Header pair fits the 1999-2000 Honda Civic SI and is part number: HHS5604
* CAD-rendered, race-inspired 4-into-1 design emphasizes top-end power for extreme racing applications
* 100% 304 Stainless steel construction including the flanges.
* CNC mandrel bends with robotically-welded fittings deliver perfect fit
* CNC-machined and threaded flanges and O-ring seals eliminate leaks
* Equal length primary piping ensures optimum tuning of systems for more power across rpm range
* Unique merge collector ensures smooth exhaust gas flow and increases ground clearance
* All systems are C.A.R.B. exempt or pending C.A.R.B. exemption
* Includes comprehensive instructions and all necessary hardware This Header pair fits the 1999-2000 Honda Civic SI and is part number: HHS5604