Three-part muffler with side branch chambers

Claim 1

IN A MUFFLER, AN EXHAUST GAS TUBULAR HOUSING, MEANS ON THE OPPOSITE ENDS OF SAID HOUSING COMMUNICATING EXHAUST GASES TO AND FROM SAID HOUSING AND INCLUDING AN INLET CHAMBER, A CENTER TUBE EXTENDING COAXIALLY OF SAID HOUSING AND DEFINING A CENTRAL GAS FLOW PATH THERETHROUGH AND RECEIVING GAS FROM SAID INLET CHAMBER, SAID HOUSING AND SAID TUBE DEFINING AN ELONGATED ANNULAR CHAMBER THEREBETWEEN, SAID HOUSING BEING REDUCED IN DIAMETER AND IN ENGAGEMENT WITH THE OUTER PERIPHERY OF SAID TUBE THEREBY DIVIDING SAID ANNULAR CHAMBER INTO A TUNING CHAMBER AND A SPIT CHAMBER, A TUNING TUBE AROUND SAID CENTER TUBE EXTENDING WITHIN SAID TUNING CHAMBER COAXIALLY OF SAID HOUSING, SAID TUNING TUBE BEING OPEN AT BOTH ENDS WITH ONE END OPENING INTO SAID INLET CHAMBER AND THE OTHER INTO SAID TUNING CHAMBER, ONE END OF SAID TUNING TUBE BEING OF REDUCED DIAMETER AND IN ENGAGEMENT WITH THE OUTER PERIPHERY OF SAID CENTER TUBE AND THE OPPOSITE END OF SAID TUNING TUBE BEING SECURED TO SAID HOUSING.