I would imagine that you will only see an improvement in the headlight performance if your D4 has the halogen headlights, and not the Bi-xenon option.
If that is the case, I am very confident that any kit sold to you by Drivesafe will give you the results he claims, and you will NOT have any issues with the electronics etc on your vehicle if you install the kit as per Tim's instructions. Tim understands the Discovery electrics and systems better than anyone I know, and his products are designed specifically for the vehicle.
I have one of his dual battery systems installed in my D4 - best addition I have made to the vehicle by far.![]()



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