Primary Cat Delete/Test Pipes are designed for those who do not want to go the full X Pipe route and are happy to modify their existing X Pipe. Our Primary Cat Delete/Test Pipes are the first in the market to use a slip on and clamp solution. This provides a solid/tight fit without the need for welding.
Here are the dyno results from a forum members E92 M3 with stock ECU and Eisenmann Rear Exhaust:
We installed a set last week on a forum members car. Here are some pictures during install.
Video of the car on the dyno and sound comparison before and after: