The EDC kit, or Electronic Damping Cancellation Kit, is a module that plugs into cars that have Electronic Damping controls. These controls are typically found on newer cars that have sport mode and active damping suspension. EDC Kits often help eliminate the EDC or suspension warning light from your dashboard that may appear when modifying stock suspension. These are mostly installed on the electronic plugs located near the stock shocks.
Most of the time, if a kit of ours requires the use of an EDC, there is a note stating that under fitment or "notes" section.
These are the EDC kits for different car models that we sell, so technically, these models may be needing some form of EDC to work: