More info on the SPAL fan...how did you wire it in?
For the lightweight stereo...I've got a car audio setup with 5 speakers. Maybe stick with a set of front comps with a neo magnet on the mid (Alpine, MBQ and JL make some) and 5 channel class D amp. Then get a decent single din and remove the OEM wiring harness. That will save you another 10-15 lbs total easily. The OEM stereo harness is pretty damned heavy for just wires.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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