- You just need to swap your existing 4GM bracket to the 04+ horns. You can easily get these horns from a junkyard or part-out as this is not a highly sort after park.
- Once you swap them, you may need to bend the brackets a little just to stay clear of the AC Condenser.
- The ground plug is same for both so no need to do anything else.
- The horn sound is much better and louder.