exhaust valves on S4 and RS4

[terminator]

are the same I know, but are the exhaust valves on the 2.6/2.8 EURO heads the same. I thought they were all the same, thought they had the same part number but now someone tells me the turbo cars run sodium filled exhaust valves while the normally aspirated heads like the 2.6 and 2.8 DO NOT run sodium filled valves. Makes head swapping from the 2.7t to anything else more problematic.

Does anyone know ? Anyone have access to VAG info/part number info. I am hoping the s4/rs4/2.6 and 2.8 exhaust valves ALL have the same part number.

 

[excursion]

Naturally aspirated cars had standard stainless valves