If you get a bellmouth downpipe and retune it, you can knock about 500rpms off of that. Your car will run better, make lots more power, and maybe even gain a mpg or two (if you can keep your foot off the gas)
Like said above,boost "kicks in" once you make positive pressure.It's as easy as that.Passing from 0 vac to psi..........info is pretty easy to find. Turbocharger - Wikipedia, the free encyclopedia
Boost kicks in as in... the point at which it starts to build pressure. ^
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