There are many ways, you can completly delete something. I have so far:
Front Bumper w/ Shocks
Fog Lamps w/ Lamp Support Bracket
Side mouldings
Airbag System w/.Bracketing & Sensors
Hood Prop
Hood Latch Assembly w/ cable w/switch
Washer bottle
Evap Cannister
Front Swaybar
P/S System
Smog System
A/C System
HVAC unit under dash
Stereo system w/speakers
Cruise Controll System
Sound Insulation Material Deleted (from firewall to hatch)
Rear Seat w/all Bracketing and Belts
Sub-brackets on Dash Support Frame
Center Counsil Supports
Differential Dampener
Padding under carpet and hatch
Quad Shocks and Brackets
Spare tire and jack
Rear Bumper w/shocks
Quad Shocks w/brackets
Tailpipes
Brake Booster
Also, there are things on the car you can replace that are lighter, I have so far swapped out:
Alumimum Heads
Alumimum Pullies
Front Coil Over Conversion
Tubular K-Member
Tubular A-arms
Flaming River Manual Rack
Catless Mid-pipe
Alumimum Driveshaft
Weld Wheels (15x3.5 & 15x8)
Drag bucket seats
LX trim
It all depends on how much you want to do but when you delete something, you don't have it so you are making a sacrifice.