Anyone installed a bad boy airhorn on your Prius. I got one from Harbor Freight and don't want to do any harm to my '08. Advice will be appreciated !
Here's a thread in the c forum: Torino Air Horn added to Prius C (pics and video inside) | PriusChat SCH-I535
I have switched to a $10 set of horns from Harbor Freight on both my 2008 Prius and my 2000 Echo. I found no need for the relay that comes with the horns. Merely add a ground to the 2nd terminal on each horn. Now it sounds like a real car.