Are all steel frame WR slip on/mufflers interchangable?

Hello, I have a 2003 WR450 with a supertrap fitted when I bought it. I want to go back to the stock muffler. I've searched but can't quite tell - will any '03 - '06 steel frame stock slip on fit my stock '03? I've read the '05/'06 stock mufflers are lighter?





05/06 had Aluminium silencers like the 07 onwards, so will be lighter than the steel silencer fitted to the 03/04


sorry can't help with fitment interchangeability

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