Renntech recently fitted one of their custom Mercedes-AMG GT S with their signature sport system. The result was a sound like it is the fourth of July, if you found yourself beside the car while it is revving its engine.

Not so long ago Renntech tinkered with the 4.0-liter biturbo AMG V8 engine of the Mercedes-AMG GT S to boost its output. From the 503 hp and 650 Nm torque of the car, the famous aftermarket tuner was able to bring its output to 591 hp and 693 Nm torque.

The boost was achieved through a little software upgrade in the M178 engine of the car. The upgrade has also resulted to a quarter-mile acceleration of the car in just a span of 11.28 seconds at 128.11 mph, according to Motorward. The top speed of the GT S was raised to 194.49 mph as well.

The goodies don’t stop there though. After the engine power enhancement, Renntech fitted the Mercedes-AMG GT S with stainless steel exhaust system. Then it was imbued with bespoke downpipes featuring the same material. In addition, a 200-cell sport catalytic converter was integrated into it.

The figures from the official dyno test of the car with updated exhaust system are not out yet. We will just follow up on that one later. But while waiting for it, check out the video below showcasing the all-new modifications of Renntech to the Mercedes-AMG GT S.