I'd like to change the factory horns to something more european like a fiamm or piaa
sounding horn...where are the horns on the 530i and is it a straight forward swap?

I'd like them to be more high pitched instead of sounding like a Buick !

 

Hella part # 85107

 

What type of installation? Do it yourself project?

 

I've found my horn, in the wheel well on the front right of my car. right behind the fog light. My car is right hand drive. I would thhink that it'll be at a similar place with your car. If you change the horn, its best if you install a Relay, which is a pretty tough job considering you have to run cables from your battery. But I haven't checked the E60 horns properly, just saw it there, it might be as easy as a swap, depending on what horn you get.