I found a good deal on a 2000 rm 250 expansion chamber.. I have a 1981 rm 250 that badly needs a pipe and i dont have the funds to buy a brand repalcement. i was gonna get one off of ebay but this deal came up...plus i like the looks of the newer pipes. Will it be hard to put it on my bike and is there a reason its shouldnt be done? Thx in advance