61GT is good for 500hp, I think? Should be... I made 512 with my T-netics 60-1, Im sure the SP61GT would make it into the 500s... And $1200 is a great price when you consider its a direct bolt on and you dont have to buy any adapters or external waste gate or a custom down pipe...
i'd say sp61gt only from experience. I'm breaking in the motor still with the new turbo and so far this thing seems to spool very quickly, around the same as the ct26.
But if you do get it then it is highly recommended that you port the exhaust manifold and get the stud lumps ground down inside, as i belive this is why it responds so well.
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