Professionally speaking, the 8.8 is reliable up to 400 horsepower. Personally speaking, I've seen them survive higher hp drivelines, and I've seen them let loose on weaker hp drivelines. If you are planning on running an engine with 400+ hp, I would get a 9 inch. Less than 400 hp, an 8.8 should be okay.
Take care,
-Chris
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