B519-C519 System Specifications: 3? Diameter Tubing Custom Tips w/ Removable Logo Tag 304 Stainless Steel Thermal?s ?True Helmholtz Technology? for Optimal Sound For the 2015 Dodge Challenger R/T, the design engineers at Thermal R&D went to work on optimizing the sound to achieve a more aggressive tone that the engine deserves ? all without letting the drone in. Thermal R&D Exhaust systems are designed with quality of sound and manufacturing as our number one goal. Built from T304 Stainless Steel, the fit and finish of our products are designed for performance on both the street and the track. Understanding that the exhaust is the starting point for many builds, our high-performance exhaust will allow additional modifications to perform at their peak. We engineer our products with the goal of achieving the best all-around product for a given application.