hey guys. i have a buddy that just bought his first dual sport bike and we're wondering about a few similarity questions. the newer xr's and xl's dont seem to be all too diffrent from the older one's and wondered what (if any) diffrences in part fittment is there? for example, it looks like most of the exhaust header's and pipes look, route, and mount similar to his. (83' XL600R) bike runs awsome but he wants to do a few things to it like a bigger tank and some othe minor things.... just wondering what diffrences there were in between the years..... (if any) any info is appreciated. thanks.