FocusSport performance exhaust systems are designed and manufactured with the performance enthusiast in mind. FocusSport uses 2.25" diameter mandrel bent aluminized steel tubing in their designs to ensure maximum flow and horsepower. All systems come with a resonator and FocusSport's exclusive stainless steel muffler, which features a straight-through design. FocusSport now uses a new stainless steel muffler consisting of a stainless steel one piece inlet / perforated core / outlet for smooth unrestricted flow, lap jointed all weld construction, stainless steel mesh packing and high temperature acoustical absorbing material. FocusSport's systems end in a polished 3.5" angle cut T304 stainless steel tip. Also included are the necessary clamps, hardware for an easy installation. FocusSport's exhaust systems are a complete flex pipe back design and come standard as with the 'Sport' option, which offers a deep, sporty track tone. FocusSport also offers a new 'Stealth' option upgrade at an additional cost. Even though FocusSport's 'Sport' exhausts were already one of the quietest systems on the market, now thier 'Stealth' exhausts offer even less sound, while not losing ANY horsepower or torque. The 'Stealth' system is a good option for anyone utilizing race headers, or for anyone that wants a relatively quiet exhaust. All aluminized systems come with a 2 year warranty. FocusSport optional polished ceramic coating systems can withstand constant temperatures of 1200 Fahrenheit and comes with a 3 year warranty - best for withstanding the weather. Available for the Ford Focus 8v SPI/16v Zetec/Duratec.