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This is particularly important for diesel powered vehicles
allow you to adjust the length and match the hanging place like headrest pole
The Serrated/Helix combination design also reduces intake whistle that occurs with other helix only designs
The vibrant red color adds a striking visual appeal
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Autolite Ar2593-4Pk High Performance Racing Non-Resistor Spark Plug, Pack Of 4 Sealants This is particularly important forAutolite Racing Spark Plugs are used by many professional race car drivers. These spark plugs contain an Yttrium Enhanced Alloy, which enables up to 8 percent reduction in side wire temperature for improved durability and less pre ignition. Autolite racing plugs are available in colder heat ranges than most plug manufacturers to support modified engines and feature a cut background electrode for improved ignitibility and faster flame kernel growth.