Picked up a nice used 2003 Gas Gas 200 EC. However, the pipe is pretty dented up and I'm looking for replacement exhaust. Noticed that the 03' 200 pipes are not as readily available as the early 99-02's? Didn't know what changed between the early 99-02 models, and the 04-to present EC 200 models? Any experience with Doma Pipes, or HGS? FMF or get the stock pipe?