Spark Plug Set, M157 / M278 Mercedes Benz Spark Plug Set, M157 / M278 Click images to enlarge Description 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. Key Features: Higher Output for High Boost Applications Colder range for better performance with increased horsepower levels Direct replacement / bolt in for M157 / M278 engines Suitable for all M157 / M278 vehicles from stock to highly modified SetSpark Plug Set, M157 / M278  of 8 Get images that make Supersized seem small.Tailor your products with Auctiva's Listing Templates! The complete eCRATER Selling Solution. Track Page Views WithAuctiva's FREE Counter