Correct alignment and a poly vee belt i would have thought would be ok...but dont operate at the same extremes you guys do....I know Pete Doughty ran a saxo pump with no probs on his silver Esc WRC to do the active centre diff and power steering.....he may be worth a call....we run the two stage MPC pump with a poly vee belt arrangement....we aint revving as high as you but ive never seen the YB shed a PS belt on a rally engine.....

HTH

Ian