I would like to note that you NEED TO MAKE SURE YOU GRAB THE RIGHT HARNESS! I was an idiot and was in a hurry whilst installing these horns and thinking I grabbed the correct harness I pulled it open and snipped the purple/green wire. Spliced it in and tried it....nothing. Just the stock horn. Took a closer look and it happened to be the harness next to the one leading to the horn; and guess what has the exact same wire...THE FRONT AIRBAG SENSOR. I patched it back together and found the correct wire/harness and got it all working right, but needless to say I was scared for my life when starting the car up. So FYI, don'e be me(an idiot) and take your time to make sure it's right. That way you don't have to make a post requiring lots of unnecessary capitalization.
Fast cars make smart people do dumb things