yup u heard correctly...any kit gives u the extra pully that replaces the harmonic balancer is bad..thats why normally unorithox comes with 3 pullies and aem comes with only two...all u got 2 do it toss the extra pully <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt='
'>.....also...it is the same problem with getting to little mass...that was one problem with aluminum flywheels....with less mass they also have less dampaning power and can cause engine problems.......damn HARMONIC RESONESE!