Thanks for your advice. I will double check, how long the alarm shop has been in business. I know that they are in the same viccinity of Toyota dealer that I have my car service. I prefer factory installed; unforunately, my car sale rep told me that 2004 4Runner v6 Sport Ed. doesn't come with factory installed alarm. May be it's the beginning of the 2004 season, therefore there aren't much choice for now.