This is a DIY on how to replace both high and low tone horns. I personally used these horns, and i recommend them to anyone looking to do this, as they are deeper in tone and loud. http://www.amazon.com/gp/product/B000DINKPQ/ref=oh_details_o06_s00_i00?ie=UTF8&psc=1 http://www.amazon.com/gp/product/B000FKKOK6/ref=oh_details_o06_s00_i01?ie=UTF8&psc=1 I'm not sure if these instructions will match with every kind of horn available, but most are universal, so i think it should I did this on my Si sedan, and I think it's the same across all trims, except the LX(or EX?) only having the high tone. Right then, onto the DIY. Step 1 Remove your bumper. I wont go into this because College Hills Honda has a great video to show how to install fog lights, but the first part of the video shows you how to take off the bumper. Step 2 Locate your high tone (right above the radiator) First, unplug the connection to the horn (#1) Second, unbolt the bracket in #2 There isn't a lot of room for a much bigger horn (without some modification) I personally had to bend that bracket (#3) to get my new horn to fit. Step 3 Follow the instructions again and undo the same bolt and plug for the low tone horn (pictured below) This horn is found right in front of the driver side front tire. There is a lot of room here if you want to replace the low tone with a larger horn. Make sure both tones work before attaching your bumper again. That's it! You're finished! Installation Pictures! High tone Low tone Now go and beep at random people with your new horn!