It is very quiet, and when it does make boost it packs a punch. It is a good deal if it lasts.

The peoplw at powerdyne are absolutely useless! The powerdyne (mine) gets major belt slippage, and I am on my third belt in a couple of weeks.

I bought an engine with the powerdyne already on it. I decided that I might as well give the powerdyne a shot. It is very quiet, but that is probably because I am making almost no boost. I am getting major belt slippage with the 9# pulley and am only seeing 2-3 pounds of boost. I am going to go down the the 6 pound pulley and see if I can't get more boost out of it.

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nitrous is way better!