No matter the application or environment, DENSO offers a spark plug featuring design innovation and exceptional performance. DENSO was a pioneer in the world of spark plug design and we haven't stopped yet.

U-GROOVE?ENGINEERED FOR GREATER FUEL EFFICIENCY DENSO's patented U-Groove spark plug enables complete combustion by allowing the spark to fill the gap created by the ?U? shape. The ball of fire created in the U-Groove develops a larger and hotter flash front that virtually eliminates excessive fouling and erratic starts caused by poor fuel mixtures.

DOUBLE PLATINUM?MAXIMIZING OPERATING LIFE DENSO pioneered the use of platinum in spark plug manufacturing. To maximize the longevity and enhance the durability of the spark plug, DENSO applied platinum to both the center and ground electrodes. Platinum's superior resistance to erosion and corrosion enables DENSO to create a spark plug capable of consistent, extended operation in excess of 60,000 miles.

DENSO IRIDIUM?THE ULTIMATE LONG-LIFE PLUG DENSO Iridium is fast becoming the standard for today's high-tech engines. The properties of DENSO's patented Iridium alloy have broken through the spark plug technology barrier. Employing a revolutionary 360° laser welding process, DENSO has created a spark plug unlike anything on the market today. Designed for durability under the most extreme conditions, DENSO's patented Iridium alloy is 6x harder and 8x stronger than conventional platinum and can handle temperatures in excess of 4,000° F.

Denso IKH22	1 Step Colder for STI, Stock for EVO 9	Pre-Gapped
Denso IKH24	2 Step Colder for STI, 1 Step Colder EVO 9	Pre-Gapped
Denso IW24	1 Step Colder for EVO 8	Pre-Gapped