What plugs do you guys recommend for replacement of the stock ones? Also spacing? any info is appreciated. Thanks

 

well when i ordered my hahn intake it came with a recomendation in the install sheet of upgrading the plugs to autolight XP's

 

I wouldn't recommend those. I used them in my old car and they didn't even last 2 weeks before they started making the motor misfire like crazy. I did make sure the gap was correct before they were installed.

 

Stock plugs are top of the line NGK iridium plugs, but they do say AC Delco I believe. You could go one heat range colder if you are tuned kinda lean and running a ton of timing but you might run into fouling issues if you start and stop your car a lot. The 07 Solstice and SKY had that issue because of colder plugs and different cam angle settings.

 

I'd stick with what it came with from factory, especially if we've got NGK Iridiums (I haven't pulled mine to see). Maybe squeeze the gap down a little if you get blowout.