2004 Wr 450f "free mods"

I'm starting to check if the free mods have been done to my bike as I am not the first owner but definitely want the most power I can get out of this. I haven't really seen much on this tutorial wise so I thought I'd ask as I go through the process (slowly). My exhaust is different from the later models and I don't have the money to replace it nor do I see a need to. I was looking to "uncork" it but I wanted to ask if the baffle/silencer I pull out is the one that resides in the spark arrestor? I have added pictures below, any additional advice would be much appreciated.

-also if there is a way to tell that my throttle stop has been replaced/cut it would be much appreciated as I don't want to pull apart the carb if I don't have to




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