i wish i saw this sooner. the exhausts for gsr's are different, and the n1 from your 97 will not fit his 01. 94-99 gsr's all have the same exhaust size. in 2000, they changed the size of the cat on the gsr (to the same size as the 94-99 LS), so if you have a 00/01 gsr you have to buy a cat-back made for the 94-99 LS. ls and gsr's in 94-99 had different exhaust sizes.

edit:
ah, nick seems to argue. he claims to have done it, but i dont see how it would work. try it and see if it'll fit, i guess.