I would be willing to bet that HKS or Denso didn't spend even a 1/4 of the time or money doing R&D on their plugs in our cars that Nissan did. Not only do they not fit properly they dont run right either. You Sir, are in the minority here. To many people have had bad experiences with these type plugs and all have switched back with better results. And as far as selling a product that doesnt fit...well, as long as it will thread down in there then it fits right? I am extremely happy that the plugs are working for YOU. I hope they open new doors in engine performance that nobody has been through yet.
I'M A HOOKER My other ride is a CH-47D "Chinook" helicopter