DC Sports race headers eliminate the catalytic converter and are tuned for all out DC Sports race headers eliminate the catalytic converter and are tuned for all out performance for racing applications. If it is needed, DC Sports incorporates a flex pipe to eliminate the chance of cracking on rigidly mounted headers. Systems that utilize spring-loaded bolts and donut gaskets do not require a flex pipe. All necessary 02 sensor bungs are incorporated into each system and a wiring extension kit is included for the sensor when necessary.