Scorpion BMW M140i Non Resonated Cat Back Exhaust System (F20/F21 Non GPF Model)Scorpion Exhausts Full Cat Back Exhaust System for the BMW M140i (Non GPF equipped model) is a great value full exhaust system to completely transform the sound and performance of your B58 engine. By removing the factory resonator, back pressure is dramatically reduced resulting in the faster flow of exhaust gases. This not only unlocks greater tuning potential and efficiency but also makes the B58 powered M140i sound incredibly aggressive. The