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  1. ECU and TCM Upgrade - Now Available

    smart Modifications
    We at SmartCar Performance are now dropping our Renntech ECU upgrades and are replacing it with a better system. We can now upgrade both your ECU and your TCM (both 451 and 450 models). TCM is your Transmission Control Module. Here is what they do (from the company that does this): "We have...
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