Mustang Thermostat and Mustang thermostat housing are two things you want to be working properly. Stock Mustang replacements or performance aftermarket thermostat for your 5.0L or 4.6L can make your Mustang or Cobra warm up a little faster. With brands like Ford Racing Performance Parts and genuine Motorcraft thermostats, you can't go wrong! Mustang Thermostat Housings, also calle Water Necks, are notorious for pitting & oxidizing. Replace your shoddy looking or leaky Thermaostat Housing Water Neck today with a brand new piece!