I installed an airhorn after a similar encounter with a semi-truck on a freeway onramp. If you are taking your bumper off to clean the radiators, splicing an airhorn onto the existing horn wiring and wiring it to the battery isn't very hard. I recommend a compact one, especially if you have a third radiator. Plus, if you leave the existing horns you can still beep someone before the airhorn triggers.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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