I have to disagree with the opinion that adjusting the valves on a 16V is difficult or beyond the skill of an average do it yourselfer. I adjusted mine a month ago when several of them were tight. I know there is a few other members on this list that have also adjusted their own. It is more complicated than a typical motor where there is an adjustment nut. But if one proceeds carefully and measures the clearance before and after there should be no problems. You can usually juggle the shims around so you will only need to buy a few. They are about $3.00 a shim.
The intake will usually be ok, but the exhaust will get tighter.