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as far as I know, no stock audi valves are stainless. if the NF head uses the same valve profile (valve head, stem size,length, and keeper grooves) then you could take the exhaust valve from the MC.
but, how many miles do you have on those valves? are they original? they should probably be replaced, and at $50-60 for stok replacement valves you might as well upgrade to the inconel valves. :)
and I would go with heavy duty springs, everyone tells me to go with the autotech springs, so, that's what I'm gonna do. :)
 
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