Today we’re going to test out the $9000 BMW m Performance exhaust on 2 identical BMW M4s. Both non comp manual trans RWD M4’s making 473 horsepower from the BMW S58 engine. Stick around for the journey and let me know what you think in the comments down below.

If you’re interested in the vehicle in the video the Regular M4 sold however the black on red one is still available.

https://www.bmwofcincinnatinorth.com/...