the nismo back box wasnt designed for the hr15de or the hr16de.
was only designed for the cr12de and cr14de. if you've noticed the 160sr has a different exhaust to the other models. so my answer would be its got different mounts but the only way to check would be to get the 2 cars side by side and take a look......go to your loacl dealers tomorrow rik lol.
this is why i never ordered the nismo one when nismo k12 got it. i think it may be ok for the hr16de but would prob only be as good as the standard exhaust. as i rekon its prob the same diameter/resistance etc.
go get one custom made thats what i want to do will be a lot cheaper than a nismo one but you don't get the name (which why i wanted a nismo one lol)
to answer the q tho rik i've no idea if they mount up the same lol
actually what about getting the the exhaust from a 15sr-a imported? its already better than the 160's think its hks aswell. guessing it should mount up the same.