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Well ripping out ALL of the interior (seats, pannels, sound deadning, carpet, etc) as you meantioned is huge. The trunk is another easy spot to save some weight...theres pbly 30+ lbs of carpet and panneling in the trunk alone. Won't need a spare in the car either.
Ripping out the AC and all associated components is probably worth 60-70 lbs as well. You will need to install a new drivers seat, as well as a roll cage (assuming this is required on the track), but you would still have a net gain with just these items listed.
powersteering is a waste on the track (find a manual rack) probably worth another 30 lbs.
Factory wheels are sometimes much heavier and less aero then aftermarket.
If you start getting really serious, you can rip out all the door components (hinges, handles, etc) and weld them shut. The glass is heavy too! replace it with plexi (except the windshield).
It can go on and on and on from here. I would suggest stripping the interior, trunk, and losing the AC to begin with. Take her to the track and see how you like it. If you really want to get serious, its going to start getting expensive quick.
Have fun and stay safe!
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