Tomei ARMS T390M TURBINE KIT EJ SINGLE SCROLL for JDM: GDB A-B/GDA A-G/GRF/GVF & USDM: WRX 01-07/WRX STI 04+ THROTTLE/INTAKE/EXHAUST The F781 material is used

The F781 material is used on connecting rod bearings for high performance engines

The wall thickness at the crown of the shell is thicker than the wall at 3/8″ down from the parting face

the true NA feeling all the way up to redline

TRIM INNER DIA

488 Black - 127400 4set B 1

Tomei ARMS T390M TURBINE KIT EJ SINGLE SCROLL for JDM: GDB A-B/GDA A-G/GRF/GVF & USDM: WRX 01-07/WRX STI 04+ THROTTLE/INTAKE/EXHAUST The F781 material is usedNew option of performance turbo for EJ Single Scroll! The all new T390M turbo kit designed to best perform especially with EJ20 Single Scroll. It comes with the same billet compressor wheel as the existing T440M turbo but covers wider range of different needs while the T440M turbo kit is mainly for tuned EJ25 and long stroked EJ22 EJ26. PRODUCT INFO APPLICATION TYPE P N NOTES EJ20 25 Single Scroll Please see the table below. T390M 173034 TOMEI Turbo