[wolfrpi]

Supras with straight 6's use twin sequential turbos to bring the boost up quick. The first one spools hard, then effectively lights the second (as far as I know). In RX7's the sequential boost pattern is something like 11-9-11 (Blackfoot is that right?).

For real performance most of the Supra guys eliminate the sequential aspect of the system and have the turbos light up at the same time. This effectively delays the lag but supposdly helps HP.

For a 951, the primarily problem I foresee is space. In addition the max hp number would probably be less for the sequential set-up than the dual set-up or single set-up. Moreover, when a single turbo is sized correctly, spool up is minimal. On a 951 you can get 350 to the wheels and still achieve max boost at 3000 rpm. I'd say any hp over that and you're looking at major reliability problems. Further, any quicker spool up and you'll be lighting the tires up all the time.

Erick