...c'mon L&L, you should know better...
search please.
here's the search list:
http://www.rx8club.com/search.php?s=...der=descending
here're a few of the threads i know are good:
4 spark plugs
and an older, smaller one:
http://www.rx8forum.com/showthread.php?s=&threadid=2011
...if you've got other questions or ideas after reading either of these two threads, just revive one please.