Diffusers adapted for use with air bag cushion inflators and air bag systems may comprise a unitary or integral hollow body defining a diffusion chamber. The hollow body may include a first longitudinal end having an aperture and an opposing second longitudinal end that is at least substantially enclosed. A module attach feature may be disposed between the first longitudinal end and the second longitudinal end. The module attach feature may comprise a lateral extent that is greater than a lateral extent of the hollow body. A plurality of apertures extending through the hollow body may be disposed between the module attach feature and the second longitudinal end. Air bag systems employing such diffusers may include an inflator including the diffuser and at least one inflatable cushion, a portion of which is coupled to the diffuser.