While factory pipes are fine, if you're ready for an exhaust that delivers top performance and a more powerful sound that deepens to a low "growl" during acceleration, then you'll want an aftermarket exhaust kit. Since manufacturers watch costs when it comes to exhaust systems, there's room for improvement when it comes to horsepower and torque. An aftermarket performance exhaust lets you more fully tap into the power of your engine. They provide a quicker, more efficient path for exhaust gases to escape so your engine "breathes" better. Spent fuel and air expel faster, so more air and fuel are burned to create more power. Many owners choose to replace a stock exhaust system with a valve back exhaust kit because there's so much to gain - intense, aggressive sound, enhanced airflow, better horsepower, and improved performance. Kits include necessary installation hardware and instructions.