Disclosed herein unique design configuration of I.C. Engine exhaust silencere forming combination of typically six cavities & opening of varing volume & areas each offering reactive impedence to noise whose frequency domain varies differently between octave band spectrum of fundamental frequency of exchaust noise. Thriught intlet port flue gas & noise (110 dBA) enters diffuser cavity and divided through 8 to 16 perforated tube, strikes oppsitely facing dish end distances 3/4 impedes between two baffles at 1/4 absorbes cancles & nullyfies at focal point of both dish ends co-inciding at zero cross over point of incident & reflected wave. Outlet is located at Null point fous at 90plane to inlet. To meet Holmholtz cavity resonance outer silencer chamber. Dimn A is varied for fine adjustedment of required volume. Inner walls of silencer are optinally lined with porous calcium carbonate. Noise level at outlet less then 55 dBA.
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