Restrictions in the exhaust system robs horsepower and torque especially on turbocharged cars. Thus, removing as much exhaust flow restrictions will increase horsepower and torque. The factory resonators found in the factory midpipe is designed to muffle and quiet the exhaust flow however this causes a restriction to the exhaust flow. Our Sports Series Resonated Midpipes replaces the restrictive factory resonators with free flowing resonators. We designed our Sports Series Resonated Mid Pipes to have a quieter sound similar to factory. The ideal solution for those who do not want a louder exhaust note than factory or have aftermarket downpipes/exhaust systems that are too loud while still providing a performance upgrade. Coupled with mandrel bent tubing which also helps promote better flow, increase horsepower and torque can be had.

Our Sports Series Resonated Mid Pipes feature a "H" style crossover. The crossover is used to equalize the pressure between the left and right exhaust pipes. This helps promote better flow and reduce droning. Through testing between an "X" and "H" crossover design, we found the "H" crossover design helped reduce droning and improving low end torque compared to the "X" crossover design. Thus, we incorporated an "H" crossover instead of a "X" crossover. At the end of the day, this is a BMW, and we do not want droning. The factory mid pipe also incorporates a "H" crossover design, so we figured BMW also felt the "H" design was the ideal solution for this application.