Looking back at some of jnsrt6's posts, I don't see one where he bought a code3 pulley. In fact, he was interested in a 181 pulley set. However, when he was selling (or wanted to sell) his car, he said there were no mods on it. It's possible (and I think I read about someone doing it before) that he had a code3 pulley, took it off, then accidentally put it back on instead of the stock one.

I'd ask him to double-check his car again to make sure the code3 pulley is not on there ... then proceed with whatever legal action you can take.