I saw two types of spark plugs available at mazsport. i looked at both leading and trailing and for each L and T, the offered two different designs. is this one http://www.mazsport.net/store/images/products/detail_174_oemnkgrx81.jpghttp://www.mazsport.net/store/images/products/detail_24_Image_RX8LeadingSparkPlugNGK.jpg


which one is better left or right? the one on the right is only 13-15$ and the l;eft one is $40

stick with the OEM spark plugs, the mazsport site should have RX-7 plugs on there as well. (which causes the confusion)

The one on the right is the updated OEM plug...seems to work much better than the previous version. Oh yeah and you can get a set from BHR for 80 bucks.

All original RX-8 plug look like the trailing plug we see today,

They update the OEM leading plug because they wanna prevent plug flooding. with gaps, fuel will not "stuck" in them, cuz wet plugs never fire :)