I'm not sure I agree. For an MTX FWD car, any more low RPM TQ you may gain with the roots-type blower would be wasted due to lack of first gear traction, IMO. Dave Kegel -----Original Message----- Roots-type is the only way to go. No offense to the centrifugal people, but centrifugal is just not proper for a heavy car with small cubes and no real gearing options. Ron Porter