Have heard the Vortech in person myself and that's why I am worried. Here is HQ video of a Vortech in a G35 and the rattle and squeaking from the belt drive is pretty loud:
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/a6LXS2luYww&hl=de_DE&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/a6LXS2luYww&hl=de_DE&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>