I just removed my back seats as well...along with over 100 lbs of extra tools, books, and other junk that was in the back and the trunk.
I don't know if it's because I'm driving my car less or because it's lighter, but I can notice something different when I drive it now, the clutch seems to catch faster, and it seems to handle better as well. Could just be in my head though, who knows.
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