Buy Product: 4-1 STAINLESS EQUAL LENGTH HEADER EXHAUST MANIFOLD BRZ/FRS FA20 4UGSE

Product Information:

  • High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability i.e. Maximizing Smoothest High Exhaust Air Flow Rate
  • TIG Welded CNC Machine Flange
  • 4-1 High Performance JDM Racing Spec. Design
  • Increase High Flow Air, Instantly Gain 10 -15 Hps
  • Exceptionally Enhance Torque at High Rev RPM
  • Runner Inlet/ Outlet Diameter: 1.50″/ 2.25″
  • O2 Sensor Insertion and Metal Gasket Included
  • Direct Bolt-On Installation, Requires NO Modification

Written Instructions

  • Lift the vehicle.
  • Remove plastic pop clips and 12mm / 10mm bolts from the undertray.
  • Open hood to get to the o2 sensor clips inside the engine bay.
  • Unclip both o2 sensor clips.
  • Unbolt exhaust manifold from over pipe with 14mm wrench.
  • With the exhaust manifold support by a stand, start removing the six 14mm nuts from the exhaust manifold studs.
  • Now remove the exhaust manifold from the engine.
  • Remove o2 sensors with a 22mm wrench and transfer them.
  • Tighten o2 sensors with a 22mm wrench.
  • Install headers with new gaskets and install the nuts by hand.
  • Tighten the nuts to proper torque specifications.
  • Install the gasket between header and over pipe with new hardware.
  • Tighten down the new hardware.
  • Reconnect the o2 sensor clips.
  • Reinstall the undertray.

Sound test not included in video.