yah and to just add on 1stgencrxer, the spark plugs u choose for u car should really be dependant on the ceramic tip that the plug has, the differently shaped tips have either more or less ceramic (or i guess u could consider less of a tip surrounded by the ceramic) the bigger tip the plug has the easier it can discipate the heat, but u need a plug that can stay hot to clean itself and also stay cool enough to not start glowing and cause predetonation, and other unwanted conditions, i know i have a site on this..... ummm... here u go,
http://auto.howstuffworks.com/ignition-system2.htm
read up on this and go into the differences in the plugs. this will give u guys a little better understanding of what ur putting in ur cars. i use normal 1.99 plugs and check them often because plugs are one of the easiest things to check to diagnose ur engine and its condition, and should be one of the first things u check when u run into any problems with ur engine.