which ratio is best?

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550-600hp RB28 twin turbo setup

high torque + high response = great balance
generic power curve on R34 6spd mission chart.

Final Drive options 4.1, 3.9, 3.5

light blue = vacuum, high AFR, and good mileage area
orange = building boost
green = target area for performance driving
red = redline area

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purple = corner 10-16 at Fuji Speedway

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FM/AM and TUNE switch... converted to High and Low Boost settings

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awaiting custom stickers to cover old switch names