Boost Logic Formula Series Titanium Exhaust for the BMW G80/82 M3/M4 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 mannerisms yet an exotic titanium pitch. However, at wide open throttle, it transforms into a sound that screams like no other BMW engine you have ever heard before, creating a truly exhilarating driving experience. Factory Exhaust: 86lbs BL Titanium Exhaust: 35lbs https://www.boostlogic.com/product/boost-logic-formula-series-titanium-exhaust-for-the-bmw-g80-m3/