[KingLT1]

Those were older generation PD blowers. Alot has come along way far as efficiency in just the last year and it's only getting better in the near future. Magnuson is releasing a 2300x that flows another 150cfm at the same boost level...Whipple has also made some improvements over the last year. The gap in efficiency between Centri and PD has narrowed significantly. For primarily a track car I still give the edge to Procharger, but on the street it's hard to beat that instant power and you still get much improved efficiency for consistent top end pull.