Brisk Iridium Performance P21 DOX15BYIR Spark PlugP21 DOX15BYIR Iridium Yttrium Brisk Performance Spark Plugs Brisk SKU P21 DOX15BYIR Parameters: Thread Diameter 14mm Thread Reach 22mm 7 8" Hexagon 16mm 5 8" Seat Type Gasket Design Iridum Yttirum Resistor Yes Projected Yes Heat Range 15 Brisk P21 DOX15BYIR Replaces: With very long lifespan, the P range Brisk spark plugs are the most modern design to fit modern highly efficient and stressed engines. The Iridium core center electrode is surrounded by

3VR14S Brisk Racing Silver Spark Plugs Ford 3V V8 Supercharged / Turbo / Nitrous Engines

Brisk COR10LGS Replaces:

5mm Silver center el

GR15ZC Brisk Premium Racing Spark Plugs ZC ZS

NGK 93593

Thread 12mm

displaces heat more rapidly

GO11LGS-T Premium LGS Brisk Racing Spark Plugs

Brisk P1 DOR15YIR-9 Replaces:

This plug is intended for use in the Gen 4 Ford 5

The Brisk Silver Racing plugs have a fine wire center electrode (not just the tip)

Brisk SKU  -  DOR15YTE-1