Thanks for the reply six shooter. So you're saying that at boost, air pressure will now affect the factory fuel pressure regulator in the TBI unit causing it to no longer be accurate, thus starving the mixture of fuel during boost. There needs to be some type of fuel pressure regulator that follows the boost pressure and adjusts the fuel pressure at the same time? I was assuming that the ecm would adjust pulse width properly to retain proper fuel to air mixture and the injectors would operated within their limits. If with no additional fuel regulation and the mixture becomes to lean at boost, that would indicate not enough fuel, due to not enough fuel pressure. right?