I have a Powerdyne BD11A. I like the blower a lot. My last car had a Novi 1000, which worked well, but the Powerdyne makes WAY more low end boost, and is almost dead quiet. Nice sleeper effect.
The Powerdyne problems were mostly the early BD10, and BD11 models. If you have a BD11a, you won't have too many problems. If you do break a belt on one, you can change it in less than a half hour.
I did lunch a belt on mine by having the bypass hooked up backwards. (at 13 psi too) I rebuilt the entire blower in my living room. The guy I bought my kit from gave me around 30 belts, and a few new sets of bearings.
I would definitely buy another one.
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