Vorsprung Luftkappe air piston with higher volume negative
Fits 2018+ Fox Float 34 Evol Performance & Factory Series forks
Fits 2021+ Fox 38 forks
Requires roll pin tool to install as it is pinned to the air shaft.
Can be installed as part of any Shockcraft service (book here)

Vorsprung Luftkappe air piston and low volume sealhead for Fox 34 NA2 forks
Fits 2016-17 Fox Float 34 NA2 Performance & Factory Series forks (130+ mm only)
Requires shaft clamp to install and is threaded onto air shaft.
Included low volume sealhead increases negative volume similar to 2018 Evol spec
Can be installed as part of any Shockcraft service (book here)