What do I benefit with putting new spark plugs in my car?! And what are the best ones to get?

 

According to the literature the NGK Iridium IX is the best for performance applications. I put them in last summer and while I did not notice any huge difference, why not go with the best? After all, the spark starts everything... all other performance mods are downstream from the spark. Write up below...

http://www.ngksparkplugs.com/product...000&country=US