by simply taking out the front passenger seat, back seat, and all the crap in the trunk you are looking at 120lbs~ which is about a tenth of a second. You could probably manage another 50-70lbs from the carpet and console and swaping to a light weight drivers seat. In the end ... for all your hard work you will be lucky to shave off two tenths of a second... its not really worth it.
check out the vendors they have pulleys for good prices~
__________________ 2003 Cobra Vert (Redfire) #3938 of 5082 @ 05/27/2003
472rwhp/493rwtq -Modification List - Dyno Sheet 2012 Mustang 3.7L M6 (Kona Blue) 2011 Ford Edge Sport (Red Metallic)