civic ECU chip

First off, I would like to apologize for the mess my little brother has caused. I posted the first response saying i bought one from ebay. It was just something to try. My engine is mostly stock and I just thought it would be fun to see what it would do. I did use a multimeter to check the air/fuel ratio. The numbers were between .4v and .3v from idle to full throttle. Those arent exact numbers, thats just what I remember. Once I found out the chip was safe and not running too rich or lean, I stopped using the multimeter. The chip did make a very nice gain. While I was out of town, my brother decided to reply to all the postings after my inital post. I am terribly sorry for the mix up my little brother has caused, but would like to let you know that I did do a lot more when I was a mechanic than change oil. I wasn't fired from Nissan, I quit to move back to my hometown. I am not the best mechanic out there and I don't give information about things I am uncertain about. I also have changed my password so it will not happen again. If I can possibly say anything else to clear this up, please ask away and i will be happy to explain. I am especially sorry to oc civic for the IM that you had with my brother. I don't know what all was said but I do know it was not the nicest IM you have ever had.