IKJ, The correct way to test to see if the plugs really made you bike faster would be to do a blind test with one of your good friends. Have your friend change both plugs out several times without you knowing which plugs are in the bike and you recording which times your bike seemed faster. If it matched up with the Iridiumn plugs then you would really know. He could even put the same plug in twice in a roll to really mix things up. You record, faster, slower, or no change. After several rounds of changes you would find out if what you think is correct. Of coarse this could also tell you that you are full of it, and maybe you really do not want to know that? But then again isn't a perceived performance gain as good as a real performance gain if there is no clock, track, or competetor?
Vegas
