The K&N Performance Exhaust System is engineered using advanced computer software and real world experience to provide optimal horsepower and torque gains. K&N uses 304 Stainlees steel from the exhaust mount to the tip. This exhaust system is designed to have an aggressive sound. The stainless steel exhaust tubing is mandrel bent for maximum flow and dyno tested. K&N has decades of experience in the automotive aftermarket and is bring that experience to the table in a quality performance exhaust system that works great with other K&N products. K&N exhaust systems are street-legal in 50 states, backed by a 1-year warranty, and will not void your factory warranty. Each kit is designed with a simple bolt-on installation to make things easy for you. Get the sound and performance you need in your truck or suv! | K&N Performance Muffler 67-1561