Not that many crj sounds around the FS
websites. I can think of one CRJ sound I used to have but it wasn't realistic so I'm not going to recomend it. In addition to trying the Christofer Petersen CRJ2 engines sounds from the previous post. You should also try the Project SkyWorks Bombardier CRJ-700 Sound Package. Just type in Bombardier on the search at Avsim with FS2004 sounds it should be the only choice that will come up. I have flown in a 700 and it sounded amaizing. I use that sound even for the 200 type.