Using a '99 model V6 test vehicle with an automatic transmission, we were able to measure a 0-60 improvement of 2 tenths of a second and you can expect anywhere between 7-10 more horsepower at the rear wheels. Owners of 2001-2004 V6 Mustangs can expect around 12 more horsepower at the rear wheels while 1994-1995 Mustang 5.0 and Cobras will typically receive 12 more rear wheel horsepower over the stock air meter and filter assembly. This package comes complete with everything that you need to replace your factory mass air meter and air filter assembly. It includes our 700cfm 73mm non-flanged unit with the appropriate calibration installed, a rubber adapter sleeve for the rear of the air meter, a 9" conical K&N air filter, a plastic heat shield that covers the air filter and draws COLD AIR in from the fender, installation instructions and installation tool.