Learn how to install Hella Supertone horns on your 2006 Subaru WRX STi.  We also used a wiring kit from Lightwerkz.net.  You can create your own wiring harness if you wish from store bought materials.  And remember, you can be creative with where you mount the horns, we got a bit lazy and hooked them up to the easiest spot available.

Hella Horn Wiring Harness

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Soobyguy sells prewired harness for plug and play eAse plus it has the black box thing u must install to avoid issues trust me. The mount they sell also puts the horns next to eachother evenly behind front center grill. This guy sux
add a sound clip so we can hear. thanks.