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I have a vacuum booster to assist the brakes. The engine just didn't make enough vacuum to run the SPF brakes. Yes, it makes noise and vibration when it kicks on. It starts with the fuel pump when I turn the key on. It kicks on when it needs to add vacuum - when I use the brakes. Yours may kick on a bit more often because of the automatic transmission. We added the supplied rubber bushings to minimize the noise and vibration. It helped a little. I don't mind it. It let's me know it's working. There are belt driven units that others have installed. You may want to ask about that.
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