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Real world HP difference?

Car is an 03 Cobra 283ci 4.6 mod motor, fwd facing headers, glide, 3300lbs 28x10.5 slick running a gt47-88 now need to run an 80 for a class
Around 150hp or so. Been there done that with another customer. The GT42 turbine simply can not feed enough air through the turbine side to fully utilize a GT47-80 comp wheel. You need at least a turbine that will support around 55-57lbs/min on the exhaust side to feed a 80mm comp wheel.
 
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