Flowmaster Force II bolt-on exhaust systems deliver mild to moderate sound levels, along with the performance gains you expect. This system for the 3.6 liter Grand Cherokee is an emissions legal system that features custom tuned resonators and a single Super 50 series muffler and is manufactured in the USA. Flowmaster's lifetime limited warranty protects your investment as long as you own the vehicle. Super 50 Series performance muffler offers a moderate to mild sound level and increased performance 409 stainless steel construction delivers extra durability and improved long-term corrosion resistance Tuned resonators control interior sound level for a comfortable ride Max dyno gains of 11 hp and 15 lb-ft at the rear wheels 2.50-inch 16-gauge mandrel bent stainless steel tubing helps maintain maximum exhaust flow for better power