Can I safely put a tuner on my 01 Cummins with 275k without causing damage to the engine?

 

First things first. Do ypu have a aftermarket lift pump? Hoe about gauges? If not get those to things first. At least a fuel pressure gauge,trans temp if auto,boost,pyro. You should be ok as long as you have gauges to monitor everything.

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Naw man, its 100% stock. I bought it about 2 weeks ago.