Even though you're not pressing the actual horn button, I'm taking a wild guess in saying that there is probably some flex in all of the plastic while you're holding the button down.
Try tapping the button as you turn and see what happens.
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Borla S-Type | Motordyne | Z1 (lots) | South Bend | K&N | Nismo/Nismo S-Tune | Eibach | Aerojacket | Fujimara | Spl | ZSpeed Performance | Kenwood-Infinity-Sound Ordnance | Whiteline | Ecutek | Hotchkis | Clazzio | VQ Vortex |Morimoto XB |Dynosty Tune 329.64hp 265.73 ft/lb
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