Anti-surge compressor housing (3" inlet), 57 trim, left handed shaft, 360 degree thrust bearing, ported exhaust housing (to increase spool and flow), genuine Garrett -17 actuator (std RS500, this is just slightly stiffer than -31)
Turbo was purchased brand new from TurboSystems in 2009 and has covered 3k miles. No play in shaft and doesn't smoke.
£850