Exhaust X-Pipe for Maserati Quattroporte Base (2014-2023)High Flow Exhaust X Pipe for 2014 2023 Maserati Quattroporte (M156 F160) What it Does: Replaces the restrictive factory mid section resonator with a high flow X pipe crossover to optimize exhaust scavenging and enhance the acoustic profile of the twin turbo V6 engine. The Stock Quattroporte Resonator Bottleneck The factory exhaust configuration on the M156 generation Quattroporte utilizes a heavy, baffled center resonator designed primarily for sound