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he hasnt Dyno'd yet, He is pushing 14lbs but car sputters at that boost and resricted fuel pressure, he has a new upgraded fuel rail/injectors/regulator so after he installs that he can push 17-18lbs safely. Id say hes above 300-350hp, closer to 350, after the install of the fuel items close to 400 on a tune.
As mentioned above go to Supramania.com and you will find more information then your brain can handle. I run a 57 trim CT with a ton of other mods and did 350rwhp but will be going back again to do 400rwhp here soon on pump gas! The car is an absolute blast to drive. But any way you do it there is a method to anything. If you upgrade turbo then you need to do MHG, ARPS, Lex AFM, 255 Fuel pump, AFPR, 550's, some management and on and on. Look at my profile to see my mods. They are good for my goal of 500rwhp at 18psi, that is when I go tubular manifold and gt35r this winter! But PM me with any questions but I am on SM all the time under the same name. So if you are ever looking for an intake manifold for it when you do upgrade I am your man!