Hooker BlackHeart Axle-Back Exhaust SystemHooker BlackHeart introduces their Axle Back and Cat Back dual exit exhaust systems for the 2003 to 2008 Nissan 350Z. These systems are designed with 2. 5 inch mandrel bent 304 stainless steel material for excellent corrosion resistance and maximum exhaust flow for improved performance. The systems use a polished high flow muffler design that not only looks good, but also provides a deep performance tone that will make your car stand out from the