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I have warranty concerns and I didn't do anything besides a RotaFab and an axle back and I did those the day I brought it home on a 900 mile drive from Detroit. As far as the engine, tune, and washing away the powertrain warranty I wanted to get it 6-9 months down the road and >5K miles on it to ensure that it was all solid before I opted for anything else. If I do anything else it would be a tune for Ethanol and that's it. But like I said I def wanted miles on it and figure its not going to pull some wonky failure that ends up with a engine/trans/diff problem.
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