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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...
  2. I ordered RENNTECH's ECU upgrade for US 451s.

    smart Modifications
    Yesterday, I ordered RENNtech ECU new reflash specifically written for our US market 451-431 (71 hp). Renntech was founded 20 years ago by the former Technical Director of AMG North America. He is known for the development of the famous four valve "Hammer" engine, ''the 186 mph 4-door that...
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