well from what i know about the b5 it seems like it does have a few inprovements it does look stronger and has a 8000 RPM clutch which im pretty sure the 5b doesnt then it has those dirt gards and the tyres look really good but im not sure it looks as good as the 5b the shell just looks a bit odd but then again im guessing proline will be able to fix that
and its very overpriced since all your really getting is a 5b ss with a different shell and clutch :/