I see no link and I hate apps that I don't already have.
A lot of people used to use those apps to document there installs
then the Hosting company's decided it would be a pay for it option
and some really nicely documented installs disappeared as far as
the pictures were concerned.
Someone must have modified the car.
or 330d's are somehow different.
Although that seems pretty far fetched.
Take off the side cover over the rear wheel or use
a mirror and start looking for the harness or amp.