Anyone upgraded their ND horn to two tone? Any risk of upsetting the CANBUS system even with installing a relay?
There are 2 weedy horns on the ND and I removed them and fitted a Stebel Nautilus using both power supplies to power it. Nice and loud now!
Where did you mount the new horns? Straight swap for the original ?
You will have no problems.
I have twin air horns, the pump and horns will fit behind the front right wheel arch liner. I used a relay with the power line directly to the battery with an inline fuse. It is easy to route the cable along the underside of the front shut panel. I used the original wire to the horn behind the wheel arch liner as the relay trigger and removed the horn. Remember to detach the wire to the second horn behind the front grill. (I did not realise this was a separate feed and could not understand why the old horn worked as well as the new ones)
I mounted it inside the r/h side wheel arch to protect it from most of the rain. I didnt use a relay as I was using both power supplies from the oem horns.