EDFC Tein Active GPS Kit (optional)Tein EDFC Active GPS Kit For use with Tein EDFC Active and Active Pro controllers. By using the GPS kit as an input to the Tein EDFC Active you can enable automatic damping force adjustment according to the changes in vehicle speed measured with GPS sensor. 2 separate modes available; "S Arrange Mode" to adjust damping force when vehicle reaches the preset speed (max 10 memories) each time, and "S Linear Mode" to adjust linearly at all speed according