boost level?

I seen a screen shot of one but to do not seen it in the tuning option in game is it only for certain cars?And I'm not confusing it with Nitrous it say's Injection Quantity.
 
I don't think there's really a point for it unless you could bend rods and stuff. Otherwise why would you want to lower boost?
 
You can limit power via power limiter, but as far as I know you can't adjust turbo or supercharger boost.
 
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