The problem is off boost throttle response. It will be a dog in the lower RPM ranges. You will loose the VE of the motor. Also, it will take more boost to make the same HP on a car with a lower compression ratio. It is the old school way of thinking. With today's electronics and fuel that is available it just doesn't make any sense to drop the compression ratio. There is a point where the HP and boost get's high enough that the compression ratio will need to be dropped. I am not sure where that level is.
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