It depends who you talk to. Both the specialists local to me reckon that the pump doesn't need to be changed unless it's weeping as generally they make themselves known.
As for the rollers, PCT reckon to leave them until they give trouble. My other specialist insists on changing the rollers everything, believing that the belts (assuming they are Dayco or ContiTech) are strong enough, but that the tensioners normally fail (and he lives and breathes 80s watercooled Porsches). He does race them for a living though.
Well, if it helps you I just spent a bit on mine. Had a new engine fitted and the cams dialled in, and whilst I was at it, got the belts and rollers done as a matter of course, and also the clutch from Sachs. It drives lovely now (it did before bar the noise!) and I've enjoyed the 6,000 miles I have covered in it over 5 months. Yes it's cost me a bit now but I now have a car with a half decent shell and a tidy interior too, but to be honest any half decent car does (my Peugeot 306 cambelt change cost around as much and is trickier to do right with many garages getting them out by a teeth or two (£300 from most places), and they need doing every 3 years or 30,000 miles, a bit different to the Porsche, so the No such thing as a cheap Porker applies to a certain level IMO. Try changing an ESP sensor for £1k+ on an otherwise mint 54 plate Passat

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