Steve's Toyota Supra Turbo
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Turbo Visual Comparisons

Compare the SP74 (left) to the T64 (right) - nothing too interesting on the compressor side.
 

Compare the P-trim (T64) exhaust wheel in the middle to the Q-trim (SP74) exhaust wheel on the right.  The Q trim is slightly larger than the P although it's hard to see from the picture.  The big visual difference is this Q trim has a <something> degree clip to the blades to allow more flow at the expense of some spool.  Realize the turbine must still be matched to the compressor so don't automatically think "Q-trim is better."
        

(Thanks to Steve H. for the pics.)

DirectedEngineering has a nice series of turbo pictures.

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