Dyno tests revealed a peak power gain of 3.3 whp after swapping a brand-new set of OEM plugs for the colder heat range Denso IK22 Iridium plugs. Torque gains measured in at 118.1 lb-ft versus the stock plugs’ 109.3 lb-ft. Average wheel horsepower and torque between 3,000-6,400 rpm improved by 4.8 whp and 4.9 lb-ft, respectively.