If you go to the NGK link that i left for you, you can see that I searched for plugs for a 98 eclipse GSX and the search showed only one plug that will work in the car, and that is the OEM multigroung spark plug. And if you read the spark plug explination page it says that some engines are spicifically disgined to use them. So it seems like according to NGK that the motor is designed for that becuase I know there are other plugs that will fit, but they only say that the multi ground will work when you do a search.

 

I saw that, just like the stock plugs for the 90-94's are the 6ES'. Weird isn't it?
I used to have a set of 6ES' on my 2G head, now I use 7ES'.

 

My car is going to need a tune up soon. When I had my GS I used to use the NGK V- Power spark plugs. Now that Im reading thisshould Iuse either the 6ES or 7ES?Whats the Difference? Can I find these at a local shop or do I have to order fromthat site?