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Hey guys, I am a newbie to the diesel world, so please excuse my ignorance. I bought my 04 LLY 2500 recently and have been reading on here to learn about it. One thing I have noticed is that I already have an aftermarket 4" exhaust. Another thing I have noticed is that my DIC predicted gas mileage is very optimistic. It tells me I am getting 20mpg, but I am getting just under 18. I noticed in another post that trucks with tuners throw off the predicted gas mileage by the DIC. Is there any way for me to tell if I already have one? There is no obvious signs....but I don't even know where they plug in. Any advise is appreciated. Thanks,

Jeff
 

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Look on the main wiring harness to the engine, see if anything is plugged in there. If it is a downloadable tuner the only easy way to tell would be to dyno it or get someone to read it in EFI Live and compare it to a stock tune.
 
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