'Maximum Boost' gives these reasons and also exposes some of the false logics that you may have heard. It didn't just teach me about turbos, but a whole lot about modern engines in general.
At the end of the day, I feel alot more confident about designing a turbocharger system to fulfill my personal needs in a safe and reliable manner.
The only thing I would have added to this book (probably in one short chapter), is some more information on diesel engines. But for now I am satisfied.
Bottom line: If you are into high-performance autos, get this book. Get Maximum Boost.