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Currently have an 09 LMM that I pull a trailer with 5k-9k everyday. I am looking for recommendations for the best tuner for efficiency and longevity. Most people seem to push efi live but who still pushes out good tunes for it.
 

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I've never tried EFI, but I can recommend Hypertech Max Energy, I used it on my previous LMM and it worked great. 3 different settings. Nothing overly drastic/limp mode causing.
 

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I have a tune from Nick at Duramax Tuner on my 07.5, unfortunately you will not get a lot of HP like you can out of newer trucks tunes. The ECMs in newer vehicles are smarter and more capable of balancing air / fuel to avoid plugging up the DPF.
 
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