570 votes
I installed the Denso Iridium IK22's a couple of weekends ago, and i love them! They are 1 heat range colder than stock, i changed them out at 30k... The stock plugs were definitely gone, installation took 1hr. After i changed them out, the car ran tremendously smoother, and the car seemed more responsive all together.
After I replaced mk Denso Iridium IK22's with the bosch coppers the problem disappeared. It looked as if the electorodes on 2 of the Denso's were oddly eroded and were probably causing a misfire.
I was useing the Bosch +2's for about 4 months and switched them out for the Denso Iridium's, could definitely tell a difference.
denso iridiums - changed to these a month ago, and car feels more responsive and smoother
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