Assuming you're talking about Stock class, that is a difficult class to judge. Technically if it wasn't on there when it left the factory, it could count against you. However there are instances where Nissan has consolidated parts over times for various reasons. Sometimes they run out of a part and a new part supersedes an older part. Sometimes a part had problems and is replaced by a newer one. The fuel line heat shield kit is a good question, and I don't know the answer. It's not a factory part technically unless it came on the boat. Dealer installed is usually not allowed.