Exhaust Valves: Std. vs CSL

[Niklas]

Hello comrades, has anyone who has bought a set of new CSL exhaust valves noticed any visual differences between the standard and the CSL exhaust valves? I have an offer for used CSL exhaust valves. How can I verify that they are genuine CSL valves?

[Slideways]

CSL exhaust valves have a point in the middle:

[bmwfnatic]

They used to, I believe if you order them now you just receive normal ones, so I've been told. Despite the CSL part number still existing.