He will not get any of my business (not that I bought from there recently anyway). This was outright fraud and not copyright or copying and is a bit different.
Also let's not forget that the Z1/AMS stuff, while different, runs deeper than just copied parts. There are dozens of other customer service issues, bad faith and other issues that are very well documented.
WARNING: 300degree Fuel Rail Buyers - Cheap knockoff kits are being sold as 300D parts. Click for safety concerns/info. Avoid AMS Products - Killing Z32 product innovation, one quickly copied, questionable Chinese part at a time. Avoid Z1 Motorsports - Hacked TT.net deleting years of proof about service nightmares, employee misconduct and lies about parts. Use trusted vendors instead!