Reportedly up to 73% efficient @ approx 55k rpm. "Supposed" to take up to 25 psi. Interestingly, no one has mentioned underhood temp's with turbo's or air inlet temp increases. All blowers heat the inlet air, some more than others. To me., a centrifugal seems most like a LARGE turbo,(compressor side), driven by belt instead of exh pressure. Sometimes "under pressure", is good. ateam :twisted: