According to the backstory/history, Grand Rapids was and still is a big furniture making city. Thus for the Chairmen nickname. Still don't like that though lol. My vote went to Horsepower.
My issue with Horsepower is it's three syllables, and so is Grand Rapids. I'm obviously being way too picky here , but 6 syllables is annoying for a full name, so Drive works for me & still falls in with the Pistons theme.