I recently fitted a set of Hella Supertone horns to my Kawasaki Ninja 300, here's a short set of photos showing how I mounted them in case someone else is stuck for ideas.
These horns are utterly massive, dual 300/500hz horns that demand a dedicated power feed.
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I shortened the mounting bracket using a dremel rotary tool and a stepped drill bit. This helps to position the horns closer to the bottom of the radiator.
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I took out the two center bolts from the bottom of the radiator (you can only do very small spanner movements here) and removed the metal clip/nut and inverted the direction of the bolt into a threaded hex extension. The horns are actualy sitting 45 degrees to ensure clearance from the exhaust.
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Ran a new fused power feed (15 amp), and wired up a relay as per a diagram in this thread.
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Final appearance
![Image]()
These horns are utterly massive, dual 300/500hz horns that demand a dedicated power feed.
I shortened the mounting bracket using a dremel rotary tool and a stepped drill bit. This helps to position the horns closer to the bottom of the radiator.
I took out the two center bolts from the bottom of the radiator (you can only do very small spanner movements here) and removed the metal clip/nut and inverted the direction of the bolt into a threaded hex extension. The horns are actualy sitting 45 degrees to ensure clearance from the exhaust.
Ran a new fused power feed (15 amp), and wired up a relay as per a diagram in this thread.
Final appearance
I love the way Hellas look through the grill of a subaru 
