Have any of you guys tried these Spark Plugs? My friend swears by them, and they do make a plug for our car... It's Part No# E3.48

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