Thanks Greg! Do you know where I can get a sealed carb. In other words one that will not leak when pressurized, although @ 4 or 5 lbs I do not really see this being a problem, I just do not want fuel leaking out of the accelerator pump are and the float. I can set the wastegate for 4 lbs easy enough, what inexpensive way would you manage your timing? I hear you can get away with retarding it a few degres. I will only turn 3500 rpm maybe close to never 4000 rpm, mostly I will be cruising @ 2800 rpm or so. Turbo lag is no concern for me in this marine application. Are you fimilliar with a design to increase fuel pressure only during boost, not @ idle. I understand a holly makes a regulator and I can make a pressure activated switch to activate it during boost. What is exactact O2 sensor you recomend for this application? Have you done this before? I am not looking to double the HP just gain a few x-tra ponies. Thanks!