walked into kragen today to pick up some 10w-30 mobile fully synthetic oil and noticed they were avertising these plugs and the pamflet they have claim that on a 2005 S will in increase fuel economy by 12.5% and 7.14% hp as well. They sell for $25 a pop with a 50000 mile life span. Thinking about getting them next oil change.

Pulstar.com has all the info on these plugs.

Anyone have any input on these things?