KG offer the following airboxes/airfilters:
1) Cobra - Available with 23mm inlet for TAG, KF and other similar applications.
Available in 30mm inlet version for KZ/ICC, Moto and other applications.
2) APE
Available in the same versions of the Cobra, 23 mm and 30mn. Same applications of Cobra.
3) Socorem
This is the pre 2004 homologation. It does not have an internal filter element and is a pure "airbox". Very effective, enhance performance of your engine. It comes with 22 mm inlet tube only. It is still widely popular and used in North Am especially when the more recent models are not allowed due to restrictive rules.