Hi guys, I need to replace my plugs in my S with new ones. I bought Denso Iridium's for it about 4 years ago, and think I should swap them out just to make sure they don't fail. I haven't had any issues tho. My question is that I think I remember having to buy one step colder due to my super charger. I notice that Denso now lists the IK22G for the S. What is this new part? I've never seen the G before. I knew I went one step colder, but it seems that this might be the same plug I used before. I know, i know, i should just pull the plug and check it. If i do go one step colder, that would be an IK24, which i don't know if they make.

Thanks.

 

IK22 for stock

IK24 for FI

This is the first I've heard of the IK22G.

 

They still seem to have the IK24 in their inventory but they don't list an application for it:
http://www.sparkplugs.com/results_cross.as...=ik24&x=40&y=10

 

According to sparkplug.com, the "g" plugs have a shroud on them. I'm not exactly sure what that means.