OBX Header 91-99 Infiniti G20 or Nissan NX-2000 or Nissan 200SX SE-R Sentra OBX High performance racing headers are made out of pure SUS-304 stainless steel. Dyno tested at low end and top speed to increase horsepower. Precision mandrel-bend to enhance exhaust gas flow. These two piece type headers are easy to install. Value-added bolt-on headers for any racing sport performance enthusiast.