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Obviously, I expect flamethrower kits—like the one from Hot Licks Exhaust—to be at the top of everyone's list. Because, you know, flamethrower.
But what's your favorite mod that doesn't scare the living crap out of tailgaters? Since I used to do a lot of riding up in the damp and chilly Pacific Northwest—206 for life!—I absolutely loved the heated hand grips on my last bike.