That's odd. When my TT kit was installed, they recommended and installed a set of OEM GTR plugs instead of the stock ones.

Yeah I googled around after my first comment and I am finding this to be the case. Not sure how that worked out. It's either a fluke from factory or the dealer had an issue with them. Because I bought the car NEW and haven't swapped them before.

I went to get spark plug today for my 370z Nismo with sC and A2A and CJM, impeller from 928 and they give me the ngk number as best and I asked for a gtr spark plugs the number is the same so I will stick with. nGK as my preference as the guy from napa told me this is the best and everyone that races and have gtr buy this.