Active Autowerke Gen 2 Equal Length Mid-Pipe – BMW F87 M2 Competition / M2 CS

  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