The K&N 67-1561 muffler replacement kit is engineered to increase performance, deliver robust sound, and install quickly and easily on Ram 1500 5.7L models. Enjoy excellent quality paired with a simple and clean appearance. The 67-1561 system maintains clearance to critical systems, and typically installs in less than 60 minutes using factory mounting points (no cutting or welding necessary). The muffler replacement pairs with most aftermarket modifications, including intake systems, throttle control modules, and more. No calibration tuning is required, and complete instructions are included.