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the dinan tune is a piggy back so it will not remove the cel, it makes power by actually send the ecu bad information, the ecu adds an additional 3-4 psi as a result of the "box" telling the ecu the engine is short 3-4psi. unlike a custom tune the timing,afr's, and other parameters are left for the ecu to handle on its own, it is not modified at all with dinan or jb4 or any other piggy back. Top speed limit,rpm raised, or cel can't be controlled with this method. Not for nothing though the only advantage to a piggy back is the price, the jb4 is 499 the dinan is around 2500 if not more, for that money you can get a custom tune that is much better and will give you all the additional options .
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