Door panels, speakers, center console, all non-essential dash pieces, glove box, remove hood liner, remove trunk liner, trunk upholstery, carpet, headliner, lexan or plexi windows, carbon fiber hood, windsheild washer fluid container (carbon fiber hoods usually don't have nozzles anyway), all trim pieces-A, B, C pillar covers, light weight battery-DynaBatt, inner door liner-just leave outer skin, door lock mechanisms, window motors, diet as needed, run on no more than 1/4 tank of gas.
This help? Basically, you want to sit in your seat(singular) (Corbeau carbon fiber or the like) and see bare metal everywhere and only one layer of it, too. It won't be very safe if you happen to get in an accident, but you'll shed a whole bunch of weight.