i had this on my audi S5 back in the day (3 years ago haha).
Alterativly you can mount it to the top of the center lower grill (this is what most people do....search around this is not a new innovation)
that works on all 3 series bumper including M3, Mtech, and OEM.
some people who are performance oriented may not like that it blocks part of the intercooler though.
Be careful with putting it up when you get pulled over.
Cops hate nothing more then when you try to pull a fast one on them.
You dont think they will realize what you did, especially with where you have it located.
If you had it center mounted you may be able to get away with it, but its quite obvious that its a moving bracket when you look at it.