After extensive R&D, Active Autowerke proudly introduces the Gen 2 Equal Length (EL) Mid-Pipe — a refined evolution of our best-selling design. Now equipped with proprietary resonators, this updated system removes unwanted rasp while maintaining aggressive tone and volume. The added benefit? A significant reduction of the annoying “2k rpm buzz” common in the S55 platform.
Owners of the original EL mid-pipe can take advantage of Active Autowerke’s exclusive upgrade program, available to verified original purchasers (proof of purchase required). Contact us directly for details.
Engineered for the Perfect Sound
The S55’s twin-turbo configuration creates uneven exhaust pulses due to the unequal length of the factory downpipes—nearly 18 inches apart. This results in a sharp, high-pitched “weed eater” tone that disrupts the natural inline-six harmony.
Active Autowerke’s patented sinusoidal crossover design equalizes the exhaust pulse lengths before merging, restoring true six-cylinder acoustics. The result is a balanced, full-bodied tone that transforms the character of your M2C or M2CS without sacrificing performance.
For vehicles with aftermarket or catless downpipes, we strongly recommend the resonated version for the best sound refinement. Cars equipped with MPE or CS exhausts should also choose the resonated setup to reduce midrange rasp.
Key Features
- Eliminates the S55’s “weed eater” rasp and 2k rpm buzz
- Equal-length design ensures balanced exhaust pulses and harmonics
- Proprietary Gen 2 resonators reduce rasp with minimal volume loss
- Lighter than factory mid-pipe
- Improved low-end and midrange torque
- Faster turbo spool and improved throttle response
- Direct bolt-on fitment for F87 M2 Competition / M2 CS
- Compatible with stock or Active downpipes and rear sections
- Made in the USA – 40+ years of BMW engineering excellence
- Patented design: US Patent 11248511 / UK & EU Patent 3882441
Important Notes
- Cars with catless (straight-through) downpipes must use the resonated version.
- Fitment is only guaranteed with stock or Active Autowerke rear exhausts.
- Off-Road Use Only. Waiver signature required before shipment.
