Hello Khiem,
Most of the sound that you hear comes from the action of the springer, a good professional tune will quiet down your CFX, make it shoot smoother and more accurate ! CharlieDaTuna is a Great Tuner of Springers and can be found at:http://charliedatuna.com/index.html
If you modify or convertyour muzzlebreak into a device that will reduce the sound, (report) at the muzzle, that is illegal.
I hope this helps you,
Bill