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You can ask mwr for base map since you are buying the ems4 from them and then drive it to get tune or have redliner9k remote tune your car.
 

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Yes it controls it. You don't need to convert it if you aren't making big power, but I did convert mine to map. All standalone are never cheap anyways and the ems4 is a good ems for the price. Even cheaper if you wire it yourself instead of using the patch harness.
 
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