Brisk Iridium Performance Spark Plug Set (4 pcs) 2014-2019 Fiesta ST *FREE SHIPPING*

NEW PRODUCT ALERT! Brisk Iridium Performance RR14BYIR-7 You've asked and we've listened. Introducing a new part number in our Iridium Performance P+ line. This is a one heat range colder than factory plug that is a direct replacement for NGK 6510 & Motorcraft SP-542 The RR14BYIR-7 come factory pre-gapped at .030 which is a perfect drop in replacement for the stock plugs.  We suggest selecting custom gaps of .028 for tuned stock turbo applications and .025 for turbo upgrade applications  RR14BYIR-7 has been optimized for turbocharged use with a beefier insulator and fine wire construction, it offers excellent performance and a longer lifespan than our Silver Racing equivalent.