Have done a little web surfing on these and they are available at alot of stores like Pep Boys, Kragens, Summit, and even amazon.com Looks like $ would be between $5.60-$10 each. The one thing that is confusing is that I looked up three different plug brands in their cross-reference and it gave 3 different plug #s to order for a Sportage<img src="/forums/images/graemlins/confused.gif" alt="" />Their web site is pretty informative on spark plug dynamics and how different designs act when firing....and of course paints a really favorable picture of their product. I might try them if I just had not put in Bosch 4's about 4 weeks ago.
I know flyboy367 has been around alot of racing and may be more able to speak of performance increases from spark plugs alone. Maybe I'll give them a whirl in 6 months.
Something else to spend money on <img src="/forums/images/graemlins/pfft.gif" alt="" />
Everet <img src="/forums/images/graemlins/patriot.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" />