Expert's advice:
The Evolution Racewerks B58 G2x M340i catted 200 cell downpipe reduces the backpressure, which results in more power and more torque, and reduces the thermal load on the turbocharger. Made out of high-quality stainless steel, the downpipes replace the OEM downpipes and fit perfectly.
Please note that the catted downpipe can cause problems due to the road regulations in your country.
Mark Hendrikx - Automotive engineer at Mosselman