Just letting you all know the blower project is over and it is unbelievable. I sent my Head unit to Carl at 928 Motorsports he replaced the impellar shaft with an all new design and added the latest deep groove bearings and Kevlar belt. This thing sound like an S trim not your typical Powerdyne, Its got a 9lb pulley with a Power Pipe, Im seeing 5-6 psi at 4500 rpm but Im letting the bearings break in before i really tromp on it.