FMF Quiet insert jetting

My 02 426 has a FMF header and t-4 muffler it's but works awesome top and bottom end,I bought the insert to knock down the db's (and a little hp I'm sure)but the bike has no bottom end, when it does hit the power band it's off to the races. My guess is the new restriction is backing things up ,so my ? is do I jet down or what?I have no idea whats in it now,I'm not comfortable enough to start dismantling things as of yet,anyone else run across this?

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