If it's a volt blaster style, look around the alternator for either a gray or white rectangular looking box with a push button and a red LED light. It is adjustable under WOT with a very small adjustment screw that is under a little round cover. It will have a brown wire that runs to the alternator connector, one wire that taps into the TPS wiring harness, a red power wire that hooks to the back of the alternator power stud and a black ground wire that typically gets attached to one of the alternator case bolts.
To remove it, you will have to take the brown wire out of the alternator connector, take the wire that taps/splices into the TPS sensor wire, remove the red power wire from the alternator stud and remove the unit from the ground wire. If you find it, and you have a Scanmaster, you can adjust it so that the voltage will be lower under WOT. I personally run one on my own car and have run the Voltblasters since day one on all of my Buicks. If it's a Red Armstrong style volt booster it will have a hobbs switch on it and a vacuum hose attached. I've never installed or removed one of those, but it works on the same principle and should be just as easy to remove. People typically mounted them on, near or behind the alternator.
Hope some of this helps.
Patrick