When I bought my zed it also had a nismo induction kit I'm guessing the same thing had happened to mine and the previous owner just put the filter on the end of the bend, it's been like that now for eight years and I've found it to be ok. I replaced the filter about four years ago as mine was looking similar to yours, with a new nismo one from the USA though all it is, is a AEM one branded as nismo. So I'd be getting one of those if I was you as the nismo one wasn't cheap by the time I'd paid the import tax.