From what I have seen there are a few options: Cete Automotive Active Valve Control AVC-S3-RS3-8V, ASR RX1 AUDI, AWE Remote kit I am swaying towards the Cete Automotive Active Valve Control AVC-S3-RS3-8V as it just plugs into the loom is controlled via the drive select / traction control switch and no separate remote. What are people’s thoughts? As they are expensive units. Are they worthwhile? Any other input on this? As I want to be able to switch between Open (overriding any drive selections) and Auto (governed by the drive mode). Also I want the wiring in the car not something that attaches under the car.