Weistec M157 / M278 spark plugs are designed and manufactured for not only high power applications but also factory replacement. The factory plugs do not handle the M157?s high cylinder pressures very well and frequently result in misfire problems, even on unmodified vehicles.
The M157 / M278 spark plugs are also 1 step colder to help prevent pre-ignition in engines that are making more power than stock allowing you to further push the envelope of your vehicle.
