from what i know the stock twins CAN do 15psi (and probly not last too long on that) but you have to run at LEAST 850 primaries (stock secondaries in the primary spot with the 850 seconds also) and upgraded fuel pump... and something to control all of it like a PFC...
-Keith

P.S. Rotary7 yeah i did turn him onto them... i LOVE my car and i am learning more and more about them everyday... i know a bit about hondas but i just like the 3rd gen 7 for my daily... i might one day build another honda as a track car... (they are REALLY cheap)