hate to tell u but more than likely it isnt nismo, theres always replica nismo ones going on ebay with the piperx oil filter! You might wanna check it but still for £22 suppose you cant go wrong. You could have got a K&N for a little more but
is it nismo "style" or an actual nismo air filter... im sure nismo never made induction kits?!
if its the style/unofficial branding then i would see about sending it back or using it as a paper weight because the filtration level of these cheep filters are TBH pants...