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Whats you timing look like from 4k to 8k in the load row that correlates to 17psi? Should be around 14-18 degrees depending on octane.
Whats the lift on those 256 tomei cams?
At that boost pressure that turbo should be capable of maintianing a flat torque curve beyond 6k. The quantity of torque isnt so important as it is to note that its droping at 6k. Something in the system is choking. My guess would be the cams.
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