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If you are running low vacuum at idle you will need to drill some holes in the weights on the air valve on the secondaries if you are getting a stumble when you stand on it. Also make sure the unit doesn't have the notorious crack in the bowl area.
What problems are you having?
Having one myself I can tell you this: The first extra $400 I have is going to Don for a Demon and the old is going on Ebay - No reserve.
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Brent Dolphin
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