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Help me quiet the beast

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So built coyote 505 RWHP and she is way, way too loud.
JBA long tubes with off road X (catted version not available) 3 “ 3-chamber 20” long resonators into factory over axle pipes into Ford Racing/ Roush round mufflers.
Still way too loud and considering Vettes, GT500s and other high end cars make tons of power and are still quiet. I want it at quiet as a stock GT or quieter with minimal to no loss in power.
I have a pair of 3” high flow cats on the way what else is there and what about high flow mufflers that are stock like quiet. I would be willing to trade my polished Motorsport for 08 GT 500s or a variable quiet muffler
 

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