Thrasher. Any turbo with a very high speed range and small compressor inducer size, will have a extremely high vacuum that builds up in the chamber just before the compressor wheel. Added to the turbines exducer axial load, this significantly increases the over all axial load (towards the compressor side) which in turn causes the spacer as well as the thrust washer to wear out quickly. But I would be much more worried about any turbo with compressor surge and high speeds breaking shafts long before that. This has been a major contributor with any turbo for the last 30+ years, even at low/medium speeds.