_x000D_ 2.5 in. Dia. - 304 Stainless Steel Muffler - Estimated Horsepower Gain 10 HP At 5441 RPM_x000D_ The KN 67-1515 cat-back exhaust kit is engineered to increase performance, deliver robust sound, and install quickly and easily on 2018-2019 Jeep Wrangler JL 3.6L models. Enjoy excellent quality paired with a simple and clean appearance. The 67-1515 system maintains clearance to critical systems, and typically installs in less than 30 minutes using factory mounting points (no cutting or welding necessary). The system pairs with most aftermarket modifications, including intake systems, throttle control modules, and more. No calibration tuning is required, and complete instructions are included._x000D_