ok i've searched and searched but can't find specific part numbers.
if i'm going with NGK platinum spark plugs, which part # is it that i'd order?

2006 350Z

 

From your owner's manual...

BTW - those are platinum tipped.

 

thanks.
so from the factory we only have single tip platinum?

is there any difference in the "laser etched" double platinum tip? (besides price).
autozone couldn't explain the differences...

 

That sounds like "marketing hype".

 

dont get them from any parts store unless they are NGK's. The parts guys will tell you up and down that they can sell you something that is identical. NGK's with the part number Dave posted only. The 5 is all you need with your current mods.