Unless you're going on track I honestly wouldn't worry about a diff in a road car. For a road car either a torsen type b or quaife. Gripper is great for track but unless you want to take the box off once per year and have it stripped down and the plates/ preload checked its more hassle than it's worth. After a few trackdays and a season of racing the preload on mine had dropped 70%.
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ZS Turbo!!*cough* (diesel)
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