I've seen spinners on a Z before this. It was back in the early days of the 350z. Some guy in a redline had them. Not only did he waste a ton of money, and add a ton of weight, but his car was Track, so he got rid of some gorgeous rays wheels, and now you can't even see his brembos!
I don't remember what the actual numbers are, but I think you lose 1 HP for every 10 extra pounds (correct me if I'm wrong). That means that he's added just about 250 pounds of filth, losing about 25 HP. For that money he could have put in the greddy TT kit, and ADDED about 100 HP.
I know trying to be bling bling was probably his mindset here, but I'd be laughing my ass off as I dropped him off a line like I was racing a yugo.