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It's between the SCT and Diablo Sport. Supposedly you can do more and have extra features with the SCT, but some people say you can do just as much with the Diablo Sport. IMO, both get the tune uploaded to your car so you can't go wrong with either. But these should be the only two brand or tuners you look into buying. Both are priced the same. The prices will only vary between the places that sell them.