Hey there,
Like they said - use light weight parts ( wheels, tires, suspention ) , you can get rid of all the sound insulation, non essential interior parts ( carpet, door panels, etc.. ) , smaller battery, etc. It just depends on how light you want it and how you want it to look?
As a rule ( old drag racing & SCCA racing days ) every 10 pound reduction of unsprung weight is the same as losing 100 pounds of sprung weight and will give you about 1/10th second improvment in the 1/4 mile.
Hope this helps
