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I wouldn't remove the plastic in the wheel wells, it will negatively impact your aerodynamics and make it REALLY noisy.
And mr2parts.net is right, my trunk gets pretty warm with the liner in it. I wouldn't take the liner out unless I was racing.
And if you are driving your car on the street, I wouldn't remove any bumper supports (I am assuming this is the rebar you are talking about), that is a great way to get yourself killed in a collision.
Honestly, without starting to strip the interior, there isn't too much weight reduction you can do. You can replace heavy parts (Wheels, steering wheel, seats, etc.) with lighter ones. You can strip the stereo system and Ac out also. There is sound insulation gunk underneath the carpeting which you can pull off the frame, which should save you a dozen or so pounds IIRC.
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