With the suggested speed limit of 82mph on the Autobahn, 112mph is disturbing? lol. But yes, the most common (and probably easiest) way to disable top speed fuel shutoff is to get a Fastchip. I have one on my '91 and it works very well, with the mods my top speed is about 150mph or so. Also remind him that 4.9's don't like to be revved over 5000rpm, unless you enjoy changing water pumps.
Here is the site for Fastchip:
http://www.fastchip.com/