RENNtech | Powertrain Control Unit | CPC TuneRENNtech Power Control Module (CPC) Upgrade for: AMG M176 engines (2020+) : G 550 S 560 GLE 580 GLS 580 AMG M177 engines (2020+) : C 63 GLC 63 E 63 GT 63 S 63 G 63 AMG M177 engines (2021+) GLE 63 GLS 63 RENNtech now offers CPC upgrade for AMG M176 and AMG M177 engines. The CPC upgrade increases torque limits and allows the engine to operate without the restrictions set by the stock factory CPC unit. The CPC upgrade is included with Turbo upgrades and