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I am weighing the options of getting the upgraded FICM from FICMrepair with the Atlas 40 tune. My curiosity is will I need to have my custom Innovative tunes rewritten or is it ok to run it without getting the tunes readdressed? I have an extreme street and an pretty aggressive tow tune that I use the most. I also will be towing a water trailer with chemical that makes the GCVW close to 24k and a skid steer that comes close to that same number. I am studded with a coolant filter and EGR delete and 4" turbo back exhaust. Any thoughts and comments are appreciated
 

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I would consult Innovative about it, but I would say probably not. The Atlas 40 is going to add a little more fuel, but only on the low end. I just believe that its always best to ere on the side of caution and ask your tuner what he thinks, as he's already seen every possible combination on one of these trucks.
 
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