Although they've been used on cars for decades, centrifugal blowers have really come into the spotlight just in the past 5-10 years. Perhaps that's due to their inherent usefulness on an EFI engine. Centrifugals must spin at incredibly high rpm to make boost. It's not uncommon to see one with a final drive ratio of more than 600 percent overdrive. But they're designed to live and work up there.