Alarm horn location?

[VAGMAN1]

Anyone know where, in the engine bay, the alarm horn is located?

 

[a4sline]

Alarm horn is located in the left side rear quarter panel, behind the trim in the boot.
Have fun taking it out if you've got bose fitted !!!!!
Bit tight

 

[dummi]

has anyone upgraded the horn to a really loud after market one? the little beeps the stock one does are completely pointless