I have the Hella Two Trumpet system, and mounted it in the same location as the oem horns. How did I do this? I removed the oem horns from the vehicle, along with the brackets. I removed the brackets from the horns, and used them to mount the trumpets, without having to modify the brackets in any way. By rotating the mounting bracket, you can position the black portion of the trumpet up close to the cross member cover. I believe that the drivers side will fit up that high as well.

I mounted the compressor along the drivers side body rail, which is covered by the plastic airdam which is removed when draining the oil in the oil cooler at oil change time. This protects the compressor from road crap. I installed a 12V relay by the drivers side headlight to provide direct battery power via heavy wires to the compressor.

I do get attention when I fire the thing off, but it keeps me safe. You can find info on relocating the stock horns at www.volvospeed.com, under the modifications page.

Ensignnolo