Using E3 spark plug in my 2002

I got 78000 miles on my 2002 Grand Prix GT and I want to change the spark plugs to the E3 brand. I been reading about them and the company claims I can increase my gas mileage up to 12% and my performance up to 13%.Does anyone out there know anything about them or ever tried them.I would like an opinion before I try them because these are expenisive plugs and a pain in the a** to change. thanks

I think those numbers are very exaggerated!!!!! The spark plugs alone will not cause that much of an increase. There are many more Mods that are proven to increase performance. If your plugs are original then i would go ahead and put some new plugs and wires on there.

Do you have a link or a picture of these "wonder plugs"? It sounds like a bunch of hoo-hoo to me, just like the claims from Splitfire and Bosch's junk multiple electrode plugs.