I sold a tuned and deleted 6.7 cummins to a friend. He ended up blowing the motor. He had it towed to the cummins shop and they said the same thing. Before they would work on the motor they wanted to sell him and install the EGR/DPF and stock exhaust:shaking:.Anyone have thoughts on the mechanic saying he could not legally work on it with the egr delete? He said I would have to return everything to stock before he would touch it. Sounds like he was just being a douche, since I did the work myself.