Akrapovic Catless Turbo Down Pipe - BMW 2 Series F87 M2Weight 1. 7 kg The next step in the exhaust tuning process is the addition of a stainless steel downpipe without a catalytic converter. This will provide the best sound optimisation and increase the performance of the car. Designed primarily for track use, the ECU will need to be remapped when this downpipe is fitted to the Evolution Line exhaust system. THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.