The only muzzle device that is going to reduce the noise signature of a firearm is a suppressor.
Any device other than a suppressor is going to increase the noise level to the sides/rear as the baffles are going to redirect the noise from coming straight out of the barrel in those directions. Different muzzle devices will vary depending on the size/shape of the baffles/holes.
If you can't afford a suppressor, the only way to really reduce recoil and (possibly) noise is with reduced loads or different powders.
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