This is an installation of the rear air springs compressor done by someone somewhere. Note the fuse , the compressor  and all that spectacular wiring spaghetti!
Now this one is the same (very similar) system installed by myself for one of my customers. Feel the difference!
This is how I like to do it – so it does NOT look aftermarket and you need to have well trained eye to find where is all the installed wiring. Here is another angle with installed control relay visible better
Closer view of the fuse
Took me a bit of time for sure to do it like this, but when it comes to electrical installs time just flies for me. Love doing this work, can’t do it in any other way but perfect :-).