The DPS patented Tubonator ® VGT is the most advanced turbine housing for S300 and S400 Borg Warner turbos. Increase Spool-up by 200-400 RPM's on your S300 or S400 turbo. Exhaust brake capable. Both electronic and mechanical vane control. Completely self contained electronics. DPS VGT turbine housing fits S300 exhaust wheel sizes 68, 71 & 73 mm, and S400 83/74 exhaust wheel sizes.