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I don't personally have a supercharger, but I've seen several kits from various venders and you're about on par power wise. Talking with Roman he would possibly change out the crank pulley to a larger one if the numbers are too low. Swapping the supercharger pulley is bound to induce some slippage. The AA stage 2 cars make about the same power here as well.
Altitude sucks. It a doesn't matter what car you mod, they all suffer. It's best not to focus on whp with guys you can never compare to. You're better off comparing the deltas of your before and after runs.
Just enjoy what you have, the 625 cars are fast!
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