Timing belt.
It does have chains driving the inlet cams from the exhaust cams but they're not a service item on the 32V engine.
Finding parts for the 32V is a significant challenge these days, with the tensioner roller being pretty much unobtanium. The FB groups are probably your best bet as new old-stock items turn up from time to time.
You need the cam and crank locking tools to hold the engine in time while you set the belt - Prestige (A8parts) have these which they rent out. You also need a replacement crank sprocket bolt and a ginormous torque wrench which can do some 400Nm. I borrow a five-foot-long 1" drive beast of a thing from the local tractor workshop!
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