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It depends how far you want to go. How about rear headrests they're worth a couple of kilos? Ditch the spare wheel and strip out the boot lining?
Take a look underneath the car and see if you've got flat plastic panels or lots of components on display. Anything smooth is good for airflow and less drag - including blocking off grilles on the front of the car.
Everything is compromise - you can keep your sub but it'll cost you fuel to carry it around hehe
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