Vacuum pumps?
I have a 404 with pretty big cam and i only get about 40kpa of vacuum at idle but its plenty, havent had any problems, brakes fine and all, no pump.
It def pulls some crap out though!
I did remember a great write up for you though, it tells you exactly how to set it up for each type of engine, enjoy.:
http://www.robertsnitrousservice.com/vacuumpumpinfo.htm
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