RennTech bits for E63

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Anybody have any experience with one of these?

RENNtech ECU Hand Held Tuner | HHT | E 63 AMG | W211 | 530 HP/485LB-FT | 6.3L N/A | M156

RENNtech ECU Hand Held Tuner | HHT | E 63 AMG | W211 | 530 HP/485LB-FT | 6.3L N/A | M156 E 63 AMG RENNtech ECU HHT (HandHeldTuner) for the 211 - E 63 AMG. Up to 530HP and 485LB-FT LB-FT. Gains: +23HP & +20LB-FT.

www.renntechmercedes.com