Man that is a lovely lady your looking at. It also has everything on it that I would install. Probably so high because of all the goodies, mileage, and un-molested? I'm the first owner of my '06. The heater blend door was a recall and mine was done in 2010 when we lived in Washington State. Would have been $2300 (then) if my warranty was expired. I'd make sure all the steering and ball joints are good, my eng oil pan has rusted through since we been back home (Pittsburgh road salt). Had a SB dual disc installed but that was because of my Bully Dog downloader. My driver's door is sagging, and I been through an a/c rebuild. I've also been through a TIPM module, they don't have to be flashed if you buy the Dorman plug and play. Driver's door is sagging I'll be adjusting it soon. Personally I wouldn't pay that much 51K or not but it will pull like a bear, mine still does. And I'm with you on the pre DPF, I'll never own one.