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Shift on the fly tuners aren't 5R110 friendly because the transmission has to "learn" each time the programming is changed. A custom tuned SCT on a street or race program will not only provide you with the most hp, but also the best fuel economy if you can keep your foot out of it. Plus you can change to a towing tune if you're towing heavy (you typically get 3 custom tunes).
 
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