Just making the call to remove the AC and Radio and all related components completely sucks a *lot* of weight out of the car. All the wiring, tubing, front condensor, the subwoofer and amps, the control modules, the central AC module, the blower, etc. It also frees up a lot of room to work with for custom wiring and dash stuff in the center dash area. There's easily over 100 lbs in just radio and AC junk to be gutted, and most of it's forward of the centerline of the car, or at least near the center. Only the subwoofer is out to the rear.
The other easy target on a track car is killing the airbag system and seatbelt tensioners, etc (if you're moving to harnesses + race seats). The airbag modules are all reasonably heavy (especially the two frontmost ones), and the curtain ones are way up high on the car (= not good).
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