Zero, no mods. I like the factory look. I'd rather spend money on machines themselves than useless crap to dress up machines I already own. I have bought replacement plastics, new flipper parts, blubs, anything that makes it look or play more like new. Of course ground mods on Gottliebs, which are mostly free. I do have a Grainger motor in my Black Hole backbox but only because that's the best way to bulletproof the original design.