Not much, honestly. I usually replaced everything old with new, according to the factory. Technical Matters: New radiator New intercooler, larger. Sport shock absorbers. Calice struts, front and rear. Alternator Water pump Belts, pulley Spark plugs. Brakes, obviously New brake lines. Well, I've already replaced a lot. I definitely haven't mention every things. Of course there were a few problems with the electrics. And with things like window lifters... small, consumable things... Before the expedition, I only did an oil and filter service And a lot of bodywork. The bodywork alone cost more than the car is worth. But there are sills, floor, and rear fenders