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The current stage 4 is gold. I have a silver one from the early days that appears to be slightly smaller and no longer available.... trying to confirm that info.
All I know is I have a black stage 2 pulley, blue stage 3 pulley, and silver stage 4 pulley.
Yep, that sounds right. In addition to those, there is a red stage 3 one and gold stage three one depending on the year of the car (rev-up or non rev-up).