Mazdaspeed NGK 1-Step Colder Spark Plugs - Set of 4

Came pre gapped perfectly as described. Car kinda pops lil when you first start it up, totally normal. Take it for a drive and it quickly goes away. Overall satisfied with this product

Spark plug replacement 2018 Mazda 3 2.5L 2004 to 2020 Mazda 3 Forum and Mazdaspeed 3 Forums

NGK Iridium IX Spark Plugs are designed specifically for the performance enthusiast. Iridium IX offers extreme ignitability, improved throttle

NGK Iridium Spark Plugs One Step Colder 2309 - Subaru EJ25 Turbo Models (inc. 2004+ STI / 2006-2014 WRX)

Denso (5340) ITV22 Iridium Power Spark Plug 1 step colder - Pack of 4 – FSWERKS

the dangers of NGK step colder plugs not good

NGK 6510 LTR7IX-11 Iridium IX Spark Plug : Automotive

NGK 95770/5992 1 Step Replacement Spark Plug

Mazdaspeed E85 Safe HPFP O-Ring Kit and NGK Spark Plugs Combo

Denso (5340) ITV22 Iridium Power Spark Plug, (Pack of 1) : Automotive

Mazdaspeed NGK 1-Step Colder Spark Plugs - Set of 4

1 step colder plugs for the BMW N54 – NGK 5992 Laser Iridium – ILZKBR7A-8G – proTUNING Freaks

Mazda Performance Parts New Products - Page 6 - page 6

NGK 1 step colder Iridium IX Spark Plug - SPEED PERF6RMANC3

Mazdaspeed E85 Safe HPFP O-Ring Kit and NGK Spark Plugs Combo