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I will add one last thing. It is hard to mail order a tune on a 5.3 that will go 13.5 N/A with AFR that is damn near perfect, that idles and drives like a stock truck. Nelson has done it with mine with no problem. I will add that the 13.5 was run at over 100 degrees, I will update my N/A time when we have cooler weather.
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Charile Wheatly does a great job as well!
I've heard alot of good things about nelson tunes from this website!
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