To be fair, the GT3 RS would kick the ever loving you know what out of the M4 on the track where the GT3 RS belongs. Drag racing or straightline racing a GT3 makes little sense when the 911 Turbo or even now the turbocharged 991.2 Carrera models exists.

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Still, a GT3 is a fast car because it is light and Porsche squeezes incredible power out of the naturally aspirated 4.0 liter motor. You can not add boost to it easily though as you can with this M4 running a BMS JB4 piggyback tune.

The M4 is also on E85 with downpipes so it's definitely a bit more aggressive than your standard tune but it is still shocking to see how easily it dismantles the 991.1 GT3 RS.

To be noted, the 991.2 GT3 is much faster than the 991.1 GT3.