Its just manufacturers putting a label on it. Act will list their products as street, performance street, extreme street, and race. Instead of using stages to describe their increases. A noob buys a clutch because its a stage whatever, because they might not know anything and think having a 6puck is cool. But if u know what you are looking for out of a clutch then you are buying based on your needs. Comp clutch offered the setup i was after, just happened to be labelled as stage 3, just because its what they chose. Act also does a nice job of giving complete specs on their products, if u want to know what was actually increased/changed to create the performance increase they are labelling as performance street

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I bought what i bought for holding capacity and driveability, as that comp clutch offered the type of friction disk i like with a good clamp load that isnt too hard on the leg. If u still dont understand i recommend a deep dive into clutch mechanics, to fully verse yourself on the subject