Thermal Exhaust When Dodge unveiled the 2015 SRT and Hellcat models, the design engineers at Thermal R&D couldn't wait to get our hands on them. We went to work on optimizing sound notes to give a more aggressive tone that the engine deserves, without letting in the drone. The final result: Designers did not shy away from the valves, adding OEM style valves that work with the factory Active Exhaust System. With a 3" system, sound control was a must. Dual drone cancelling chambers and a resonated mid pipe with balance mixing chambers were engineered and included. This allows for drone cancelling when cruising, but keeps the aggressive deep, throaty notes on acceleration. Finishing it off, we added upgraded polished tips that are slightly bigger than stock, and polished with removable polished stainless logo badges.Thermal