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  1. Classifieds
    New style Renntech Tuning Box for sale due to sale of my car. Works on pfl and fl A45 / CLA45 and GLA45. eBay item number is-284310963936 comes with; genuine Renntech badge which has never been used complete original wiring harness instruction manual genuine blanking plug so it can be returned...
  2. RENNtech UK/Collins Performance
    RENNtech Black Friday Sale now on through November 30th! Save 15% on Hand Held Tuners and Hand Held Suspension Modules. Save big on Performance Parts, Aero, Wheels and Accessories. Website is being updated to if you don't see what you want please call or drop us a message to order...
  3. RENNtech UK/Collins Performance
    We now have Hand Held Tuners available. RENNtech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal! Their proprietary tuning module stores both the RENNtech tuned file and your vehicles stock file. The module...
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