SL55/63/65/R230 AMG: E3 SparkPlugs?
http://www.e3sparkplugs.com/performance.asp
They claim guarenteed 12% power increase! Now that's hard to believe, also I noticed in the conversion chart that one plug crosses over to so many different plugs, which means they are comprimising on heat ranges which could be dangerous.
Any Thoughts?
RoydRage



