How to quiet a Doma silencer

Looking for options. I have a Doma silencer on my TE 250. Langston racing doesn't sell the tapered core for it anymore. Pro Moto Billet's insert robs more power than I want to lose. Does anyone know of a down tip or insert available? The silencer really woke the bike up, the bottom end is significantly better, don't want to lose the improvements but I want to be responsible noise-wise.

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