Before you jump on me here for asking a question please hear me out. I've been all over this and can't find a couple simple answers. First off, on the 07 is it the "grey wire" or the "blue/white, sky" wire for the yz mapping? And that brings me to my nest question (I've looked for this as well), what is the "yz mapping"? I've heard several people say they wouldn't change it back, ever, and others talk about how much more power they have and sometimes even to much power, so what is it doing? Oh, since I got you here, one more question. When you remove the "pea shooter" out of the exhaust are you also removing the spark arrester? I know in the fire business a screen on a window can cut down air flow by as much as 50%, does the arrester do the same? I would think I need to remove it as well, thought I would ask.