I will be doing a spark plug change on my 03' STR and was just curious about what are the highest performing or best performing spark plugs and how would I go about getting my hands on some. Looking forward to the feedback and what interesting products they're out there thanks in advance guys.

 

There's no such thing as a spark plug that adds performance, that's just marketing hype. Use the stock plug.

 

So between copper/silver and iridium spark plugs there is no suitable difference?

 

Get the OE kind as they work very very well. Anything else... might not, why risk it?

If you want more performance, plugs are the wrong way.

 

If you mean difference in performance, no. Cost and durability, probably/yes.

 

Thanks for the pointers gentlmen

 

I went with a 1 stage colder iridium plug in my STR with zero issues. But as stated above no performance gains will be made from a spark plug. It's all personal preference

 

Marvel's Mystery Oil and STP

 

I put in the stock Iridium plugs after 95K miles on the factory ones.
Works perfect.
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