This Flowmaster Force II® cat-back exhaust system is custom designed for 1998-2002 Ford Expedition/Lincoln Navigator with 4.6L or 5.4L engine and is perfect for the person looking for a mild to moderate sound level inside and outside of the truck, with all of the performance benefits that you would expect from Flowmaster®. This bolt-on emissions-legal system features a 2.50 in. mandrel-bent aluminized steel inlet pipe flowing into a 70 Series Big Block II™ muffler for a deep mellow tone. The single 3.00 in. mandrel-bent aluminized steel tailpipe is finished off with a large 3.50 in. polished stainless steel tip and uses the factory hanger locations. The exhaust system is covered by our 3-year Limited Warranty and includes all necessary parts and hardware for a quick and easy installation you can do at home. Notes: Fits 2/4 wheel drive models