What kind of a gain would I get from a Maggie if I have already done heads and cam? I'm at 427 RWHP and 375 RTQ! I have been working with my local shop on a twin turbo set up, but they just don't seem interested any longer. They have been putting me off for the last month. So I thought I would just do the Maggie. I want to get 550 Rwhp and 500 RTQ. Would that happen?