From my experience there is no after market ecu as yet, any stand alone will make you a lot of the standard features such as the sync rev, unless they know how to tune it back, piggy back are no gd in the long run, only option is flash, either Cobb or uprev. Cobb foes not support audm 370z and I was the 1st audm 370z, so that's why my car is still not out of the shop yet. But on the bright side uprev have now decided the audm ecu. Hard software to tune with and might cost you a fortune on map creation but you can get really gd results
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