I only learned a couple years ago that some people "tune" their cars (teens mostly, I assume, or that sort) by simply doing some sort of chip upgrade. No idea how any of that works, but I'm sure it's a deep rabbithole

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yeah, back then, chip mods were the thing. basically, replace the program, with a tweaked version that does whatever thing. i remember also around the same time there was a big move into tuned exhausts as well, with their kooky rumble... on a 1.6L engine lol