I have had my 2006 2.5i for almost a month now, and the one thing I don't like is the wimpy horn! I see Hella has an air horn that is compact enough to replace the stock horn without having to take up a lot of room, however as yet I don't know where the OEM hron is located.
Can one of you experts out there help someone who is mechanically challenged?

Sorry, don't have mine yet, but;
open the hood, put one finger loosely in each ear, have someone else blow the horn. That should help guide you to it.