DC Sports 4-into-1 and 4-2-1 header systems are dyno tested to outperform all comparable header systems on the market. Extensive research and development goes into each system to ensure the best performance for your vehicle. DC Sports header systems are precision bent on our CNC mandrel benders using data acquired from our non-contact digitizing scanner. The flanges are CNC machined, the flange-mating surface is machine-grinded to ensure a leak-free seal, and a robotic welder is used to attach the flange to the header pipes. DC Sports' state-of-the-art manufacturing process ensures superior quality and a perfect fit with every header system they make.