All of this combined with Garrett GT turbine and full ball bearing technology to produce a complete bolt-on package that includes stainless steel turbo oil feed line and steel oil drain tube and coolant lines. Adjustable upgrade actuator is standard issue on the 1.5XT-R and is pre-calibrated to operate at 15 PSI unless otherwise specified. The 1.5XT-R has a 56mm turbine to promote better spool up and a better overall turbo.