Carbon Fiber Driveshaft - save 10 lbs
Braille CF Battery - save 40 lbs
Tillett B2 seats with padding, no sliders - save 60 lbs
Toss out emergency kit - save 5 lbs

This gets you close to the torque to weight ratio of a 350z. Of course it will only cost you $2500, but hey, you asked

Of course, you can break out the sawzall, like they did in SCC:

http://www.sportcompactcarweb.com/fe...ram/index.html

They used weight-saving techniques to bring the 0-60 time of a Sentra SE-R from 8.6 seconds to 5.6 seconds. Vroom!