BMW F8x M3 / M4 Cat Back CorsaTronic Electronic

The ultimate solution to the F8X sound problem is right in front of you!

Since the M3/M4 with the S55 engine was released in 2014, everyone has felt that there is a legendary tone hidden behind a "muffled" sound filled with a sharp ring and annoying resonance.
And here comes our role at Corsatronic — our mission was to bring out the true sound hidden beneath all the noise.

This system is the solution: a complete exhaust system (Catback) with an Equal Length pipe design and a balanced H-Pipe, then the exhaust transitions to 3.5 inches at the back.
The result? A smooth, sporty tone, and a sound that transitions from the beginning of the RPM to the red line.

The situation with the valves:

• Valves open? The exhaust flows at full power from the right side outlets without any restriction.

• Valves closed? The sound drops significantly and becomes ideal for daily driving, especially if you don't want to attract attention (meaning without disturbing the neighbors 😎).

Why is the Korsatronk system different?

✅ We used an Equal Length design to reduce sharpness and keep the sound natural, aggressive, and smooth at the same time.
✅ We spent months in development and testing to achieve the perfect balance between sporty tone and enjoyable sound.
✅ Easily mounts to stock points without cutting or welding.

Compatible models:

• BMW M3 F80 from 2015 to 2018.

• BMW M4 F82/F83 from 2015 to 2020.

System specifications:

• Made from T304 stainless steel or Grade 5 titanium.

• Electronic valve system that works with the stock system.

• Lighter than the stock system by:

  • 21.7 pounds (Stainless)

  • 49.2 pounds (Titanium)

• Mandrel design for better flow.

• High precision TIG welding.

• 100% returnable to the original system at any time

Important note for S55 owners:

If you have an open or race downpipe installed, you might hear a slight rasp around 2000 RPM.
If you want a cleaner and stronger sound, we recommend installing a downpipe with a "200 cell cat" or something similar.

Korsatronk — Stay true to the sound, and let the M3/M4 express itself properly!