Installed JB4 on my F30 340i last weekend and I wanted to cut the factory plug to feed the obd2 wire through it while maintaining the seal from the outside to the footwell but I wanted to be able to reverse it so i can take it back to the dealer with the factory plug back in. So if anyone is wondering the part number for plug in the firewall to the foot well when you install the JB4 is going to be 51711855009
Pic of plugs ( New and old)
