Hooker BlackHeart Cat-Back Exhaust SystemHooker BlackHeart introduces their Cat Back and Axle Back dual exit exhaust systems for the 2009 2020 Nissan 370Z. These systems are designed with 2. 25 inch mandrel bent tubing that helps increase exhaust pulse velocity for better performance, while also reducing in cabin exhaust drone. 304 stainless steel material is used for excellent corrosion resistance and will look good for years to come. The systems use a high flow muffler design that not only