the 4.eleven gearbox that comes with the JDM wrx is magnificent. the USDM WRX gearbox is usually a POS in comparison, belief me. you will need to utilize the proper JDM gearbox with the right JDM EJ20 motor.cartridge assembly. The VF34 will spool up about 250RPM more quickly as opposed to VF30, making it an excellent all spherical performer. Ball b