1st Gen R53 Cooper S Most liked posts in thread: ScanGauge gives odd MAP readings

That is correct, there are also external wastegates that race-cars and some highly tuned street cars use that allow for more exhaust flow and better control of boost, or less boost creep.
Example:

How it's mounted:

There's good writeups on just about everything if you want to go a little more advanced than howstuffworks at: AutoZine Technical School

 

Ken
Thanks for the info.

 

But, if you need to get out of there NOW, isn't it already too late at 15 seconds?