Also, you can pick how much boost you want to build vs brakeboost you are defined by your tune. Say your tune make 27psi at 4k. You brake boost and you will make anything from 0-27psi. Let's say i don't want to launch it at 27psi but instead at 20. well you can tune it so it only builds to 20psi with BB. It will still make 27psi if you just floor it without BB.