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The only way the diff would make the car more powerful is if the differential offered less friction in its rotational assembly. Basically how much applied force does it take to turn the gears. The engine would still be the same but the drivetrain loss percentage would be less, so you would get more power to the ground.
The Dinan diff would be ok for a NA car, but would probly be too short for a supercharged car. Your also gonna be cruising a few 100 more RPMs on the freeway also. If its worth it is up to your own application and use.
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