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Old April 11th, 2013, 01:51 PM   #21
Lynxer
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Originally Posted by Renegade II View Post
This should clear it up

324.81133

Operation prohibited;

(g) Unless the vehicle is equipped with a spark arrester type United States forest service approved muffler, in good working order and in constant operation. Exhaust noise emission shall not exceed 86 Db(A) or 82 Db(A) on a vehicle manufactured after January 1, 1986, when the vehicle is under full throttle, traveling in second gear, and measured 50 feet at right angles from the vehicle path with a sound level meter that meets the requirement of ANSI S1.4 1983, using procedure and ancillary equipment therein described; or 99 Db(A) or 94 Db(A) on a vehicle manufactured after January 1, 1986, or that level comparable to the current sound level as provided for by the United States environmental protection agency when tested according to the provisions of the current SAE J1287, June 86 test procedure for exhaust levels of stationary motorcycles, using sound level meters and ancillary equipment therein described. A vehicle subject to this part, manufactured or assembled after December 31, 1972 and used, sold, or offered for sale in this state, shall conform to the noise emission levels established by the United States environmental protection agency under the noise control act of 1972, 42 USC 4901 to 4918.



so does this mean my 71 cj5 can run open headers?

pre 72?
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Old April 11th, 2013, 04:57 PM   #22
Renegade II
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so does this mean my 71 cj5 can run open headers?

pre 72?
No. That's prohibited under MCL 257.707
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