Quote:
Originally Posted by toner123
I may be wrong in this case of info but from the research I did when i was going to buy these plugs, the stock plugs in our car use the same ones as a GTR which are already heat range 8. Both part numbers are the same for the plugs if you were to order them from nissan. This i did call a dealership also and confirm, so it is safe to say I do not think the heat range of your plugs are the problem.
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true statement about the stock plugs
they are teh coldest we can use at the moment on these cars and are made by bosch. No reason to really change them out for I high price brand such as HKS.
EDIT: I found out a couple months ago when I was looking for a colder plug and contacted summit racing