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If you are talking Duramax, there were subtle changes with the emission junk between 11 and 13. I think it had to do with the DEF tank.
I don't believe they have made many changes on the Gas powertrain in quite a while.
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2015 GMC Sierra 3500 Denali CC LB DRW Sonoma Red/Cocoa Dune
2010 Keystone Laredo 316RL
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