Anti-surge.
I have the antisurge option on the Garrett T04Z mated to my VR6 Turbo:
The GT series and others have cast slots instead of drilled holes to accomplish the same function.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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