BMW M3 G80 G81 & M4 G82 G83 Titanium Exhaust System by Boost Logic (2021+)Introducing the Boost Logic Formula Series Titanium Exhaust for the G80 82 BMW M3 M4, the ultimate exhaust system for those who demand the very best in performance and sound. This exhaust system has been designed with precision and care, featuring OEM electronic controlled valves that, when closed, create Helmholtz resonance chambers. This unique design ensures that the exhaust has the perfect sound for cruising and at idle, with no drone, mild