Re: (Scotts40)
Actually, it used to be that you needed hardware - the left-side stalk with the wheel wasn't standard. But in the new models with DSTC that use the stalk, instead of the console switch, it might not be that you need hardware.
Bottom line, ask your dealer for a quote. Since you'll need them to download the software, even if no hardware is needed, they're the only way to get it.
Tom.