It does matter....obviously it matters more as the flow of air is increased (eg T4). You will see issues with the T4s more sooner then you would T3s (eg bigger blades resting on the same sized shaft). But it still causes an issue with T3s. Otherwise Ford would have not put one on a T3 producing 9 psi.
Obviously you don't have to listen to me at all, and do the f@@k you want mate, but I would rather side with caution methinks.
