Holley
1999-2004 Ford Mustang GT, MACH1 and Bullitt with 4.6L SOHC engine, Stainless Steel - Aggressive to moderate sound
1999-2004 Ford Mustang LX with 3.8L engine. - Moderate sound
2005-2009 Ford Mustang with V6 engine. - Mild sound
2005-2010 Ford Mustang GT 4.6L or GT500 with 5.4L Engine. - Aggressive sound
2005-2010 Ford Mustang GT, Shelby GT, GT500, California Special and Bullitt cars with 4.6L and 5.4L engines. - Aggressive to moderate sound
