Bought a 2020 with a FMF Power Core 4 LOUD

OK I am back on a WR, bought me a 2020 used today and she came with a FMF Power Core4 and yowza she barks. My old WR250 had a quiet Core and I put an insert in it that made it even more tolerable. What Im looking for is some advice on how to make this thing a bit more quiet. Should I sell the power Core4 or is there an insert that will shut this thing up? I want it more quiet than it is but it doesn't have to be stock, though I did get the whole stock exhaust with it. I love the look of the FMF megabomb and the muffler but damn shes loud. So is there a insert that will significantly shut it up or should I do the Q2 with a quiet insert, links or part numbers if you have them please.

As far as I know FMF has discontinued its WR250R offerings, but since the Power Core line spanned dozens of bikes, you may be able to find quiet inserts that fit your muffler; give them a call and see if they have something that would work.