I don't know how safe you want your car but you can remove a good part of the metal behind the door panels and rear panels as well as the door beams. I would only recomend this for a TRACK USE ONLY car and not a street car. Depending on how much metal you remove from behind the panels you should still be able to get them back on. Lexan windows will also drop weight as well as a cabon fiber hood and dash.
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