His name's Angus A. Ackley, and he owns a bagpipe shop somewhere in the Cars version of Europe. Sometime in the past, Lugi and Guido provided him with comfy whitewalls, either via mail order or during the duo's trip around the world with Lightning and Mater during Cars 2. A satisfied customer, Ackley's inscribed the poster, "Lads, them whitewalls feel good under me fender skirts!"
I can only imagine how loud those extra-large bagpipes might be. Luigi's probably got a CD tucked somewhere in his office, which never gets played amongst the never-ending Italian playlist echoing throughout the queue for Luigi's Flying Tires.
Yes, I'm a Cars geek. Should I mention I noticed Angus's initials are AAA?