This the Muffler rule the track sent Me

MUFFLERS ARE COURT ORDER MANDATORY ALL CARS MUST PASS THE 35 RP NOISE TEST STRICTLY ENFORCED EVEN THOUGH THERE IS A MANDATED MUFFLER FOR YOUR DIVISION, YOUR CAR MUST PASS THE NOISE LEVEL TEST.
MANDATORY MUFFLERS

AUTOZONE MUFFLER PART # 27657 IT IS ALSO MANDATORY THE NUMBER ON OUTSIDE OF SHELL OF THE MUFFLER MUST BE 159150

ALL MUFFLERS MUST HAVE TAG WELDED OR POP RIVETED TO IT WITH CAR # ON IT

OTHER THAN TO MOUNT SECURELY ANYONE WHO TAMPERS OR MODIFIES MUFFLER IN ANYWAY WILL BE SEVERELY DEALT WITH.

were still coming called and muffler only cost me $22.00.