DC Sports 4-2-1 one-piece header systems for your 2006-2011 Honda Civic Si delivers the same incredible low to med range power gains, while improving ground clearance and reducing weight by eliminating the middle flanges. Our 4-2-1 one piece headers are much lighter then stock systems and are on average two pounds lighter than our two piece systems.
- Dyno tuned and tested against the competition for maximum performance.
- CAD-renderend, drag inspired 4-2-1 design emphasizes low and mid range power for street/strip applications.
- Unique merge collector design improves ground clearance.
- Equal length primary piping ensures optimum tuning for more power across rpm range.
- Comprehensive installation instructions, all necessary hardware and decals included.
- Legality Status: CARB/ 50 State Street Legal.