Friend had that (adjustable diff) in their old Turbo Technics Sierra XR4x4. It had 450bhp, but 600ftlb of torque so any adjustment you could get was helpful. Mentalist car. 3L twin turbo with piggyback. All panels fibreglass. Kat body kit. Cosworth style rear wing before cosworth one existed. Konis. Boost selector. Rocketship. Sold it when leaded petrol ceased to become an option.

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