bit of a loose question, depends on how much comfort you want and how much you want to keep the noise down

i have personally removed the std seats and i have sports seats

(not fixed buckets) i have removed the entire stereo system and speakers, the spce saver, all the sound deadnening

(the firewall carpet weighs a bit too)

you could of course remove the power steering, abs, have lightweight wheels, lightweight calipers/discs to imporve the unsprung weight, coilovers must weigh less than std suspension.

lightweight panels.

half a tank of fuel instead of a full tank.

dashboard, and ALL interior trim.

boot carpet and boot lift spring etc etc, the list is endless, remove what you can do without

(safely)

personally if i lost a stone

(or 3) id put the stereo back in, and on a serious note if you need to lose a few pounds then thats a good place to start

- you dont see many overweight racing drivers

- well winning ones