Hooker BlackHeart Cat-Back Exhaust SystemHooker BlackHeart introduces their Cat Back dual exhaust system for the 2017 2021 Dodge Challenger R T and T A models with the 5. 7L engine and factory active valves. This system is designed with 3. 0 inch mandrel bent 304 stainless steel material for excellent corrosion resistance and maximum exhaust flow for improved performance. The system uses pair high flow mufflers that not only look good, but also provide an aggressive to moderate performance