What i did with my GT was i pulled out the carpet and ripped off the heavy insulation attached to the carpet, i also took a heat gun and a scraper and took all the "tar" insulation off of the floor. I probably lost 40 lbs from that and the with the carpet in you can't tell i took out anything except for the increased road noise and heat transfer from the exhaust, also taking out the spare tire/jack and carpet mat will lighten your car. any little bit helps.
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem 
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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