Mine were installed above the passenger side above the A arm on the frame. between the header and the frame on the frame flat frame plate there. The holes are already there and there is plenty of room. I just pulled a musical set from in front of the radiator of Sling II. That was a piece of shit install. You can use the stock horn wire for the relay control and run a new 12 volt power wire to the relay. The stock horn wire is too small to run the air compressor.
Yep, that's where I looked too. The Turbo tubes block that spot (not enough clearance). And that's exactly what I was going to do - run the stock horn wires to the relay and the main wires through a fuse box I already have set up.