Duramax, 06 or 07 classic, both are pre-dpf ( diesel particulate filter) equipped, both have 6 speed allison which can handle more power than the 5 speed stock. I have a 06 with MPI twin turbos, built trans, it's the fastest vehicle I have ever owned and I can still tow my 13000lb camper anywhere. Never had to fix anything on it, hands down the best vehicle I ever owned.
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