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  1. 6.0L Performance Parts Discussion
    I've been very hesitant to google "tuners" wouldn't even touch it with a 10ft pole, but thought I'd take the plunge and see what they were about, since my brother in law has a dodge cummins 5.9l and gets 25mpg with tuner and 15mpg without made me want to do some digging and of course he's giving...
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