Well this will be my first time doing a spark plug change on my 2.5i. I've been to SparkPlugs.com, so I guess my question is would it be better/OK to use Iridium plugs or should I just stick to the Double Platinum on my N/A engine? Also, anyone got a brand they recommend? The choices I get for my search are Autolite, Bosch, Champion, and Denso. Thanks for the info