2011 gmc 3500, duramax, well maintained, always use amsoil full synthetic, upgraded big cat fuel filter, glow piugs replaced, 9th injector replaced,def tank and heaters all replaced,transmission flush( not just drain and refill. Runs great, shifts perfect. Mcgauphys 7 inch lift, ingogntio steering braces, recent alignment, 20 inch fuel wheels( all 6) amp research steps, proline headache rack.clean interior, has usual dings and scratches from normal use over 10 years. Has low 160k miles. Now the bad, the variable vanes in the turbo are frozen( common problem and it sets a code, so will not pass smog. I do not want to deal with it anymore and am not using the truck enough. Still runs and drives perfect, just need to clean and free them or...