So guys, sorry to ask again, how about that HKS part number for Spark plugs?
spoke to my local dealer today about the standard GTR plugs, they want $48/plug, this is COST price as I do IT work for them, I even saw it on their systems with my own eyes, retail was like $63+. fairly sure the HKS kits were around $200ish?!
so from here -
HKS USA M-Series Super Fire Racing Spark Plugs
I've found - 50003-M40HL NISSAN 370Z 2009-2010 8(heat range) 1(qty) $26.97
also - 50003-M45HL NISSAN 370Z 2009-2010 9(heat range) 1(qty) $26.97
Which ones are everyone using, I'm GUESSING the 8, but want to be 100% sure.