2004 Excursion 6.0 diesel.

We'll my curiosity got the best of me today, and I went to look . Previous owner has all his maintenance records. Had a sinister egr delete ,oil cooler, and coolant filter kit installed. Head bolts replaced, injector replacement. Head gasket replaced prior to sinister kit.. Rear air bag suspension, Reese brake controller ball joints replaced and replacement wheel bearings.. A few other odds an ends that I can't quite remember ATM. What do you all think? Will walk away at 8,900. Has 2011 date code on all 4 tires and all the fluids done a few months ago.. I'd say tires have about 50% tread.
I'm trying not to get romantic with this rig.. But it is a beautiful unit.