Tomei O2 Sensor Bung And Plug 51220-SNA-A03 dual valve springs as well

dual valve springs as well as allow F20C/ F22C engine to use the K Series valve springs

A must-have if you regularly use your Skyline on track

This throttle body improves output by increasing the flow area and increasing the amount of intake air by enlarging the butterfly diameter

Even under intense stress

Regular greasing not required

Tomei O2 Sensor Bung And Plug 51220-SNA-A03 dual valve springs as wellThe use of an A F sensor and gauge is an indispensable tool for engine tuning. To acquire the A F reading, an O2 sensor needs to be installed on the exhaust manifold or the front pipe, along with installation of A F gauge. This O2 sensor bung is then required in order to installing an O2 sensor on your car. A bung plug bolt is also included for when the O2 sensor is removed.