from the Garrett PDF catalog on
www.limitengineering.com
Clipped Turbine Wheels- When an angle is machined on the
turbine wheel exducer (outlet side), the wheel is said to be
‘clipped’. Clipping causes a minor increase in the wheel’s flow
capability, however, it dramatically lowers the turbo efficiency.
This reduction causes the turbo to come up on boost at a later
engine speed (increased turbo lag). High performance applications
should never use a clipped turbine wheel. All Garrett
GT turbos use modern unclipped turbine wheels.
doesnt sound like a good thing to me.