It's pretty much the same since it is all federal regs which the states must adopt.

 

This stuff is easily found using Google.

Indiana:

IC 9-19-8

Chapter 8. Mufflers and Noise Limits

IC 9-19-8-1

Application of chapter

Sec. 1. This chapter applies to every motor vehicle except an antique motor vehicle

registered under IC 9-18-12-1.

As added by P.L.2-1991, SEC.7.

IC 9-19-8-2

Muffler leaks, alteration, or deterioration

Sec. 2. A motor vehicle must be equipped with a muffler free from the following

visually discernible conditions:

(1) Exhaust gas leaks.

(2) Alteration of muffler elements.

(3) Deterioration of muffler elements.

As added by P.L.2-1991, SEC.7.

IC 9-19-8-3

Operation of muffler or noise dissipative device

Sec. 3. A motor vehicle must be equipped with a muffler or other noise dissipative

device that meets the following conditions:

(1) Is in good working order.

(2) Is in constant operation to prevent excessive noise.

As added by P.L.2-1991, SEC.7.

IC 9-19-8-4

Muffler cutouts and bypasses

Sec. 4. A motor vehicle may not be equipped with any of the following:

(1) A muffler cutout.

(2) A bypass.

(3) Any similar device.

As added by P.L.2-1991, SEC.7.

IC 9-19-8-5

Excessive fumes or smoke

Sec. 5. The engine and power mechanism of a motor vehicle must be equipped and

adjusted so as to prevent the escape of excessive fumes or smoke.

As added by P.L.2-1991, SEC.7.

IC 9-19-8-6

United States Department of Transportation regulations; classification of violations

Sec. 6. (a) This section does not apply to a person who owns or operates a vehicle or

combination of vehicles that:

(1) contains parts and accessories; and

(2) is equipped;

as required under regulations of the United States Department of

Transportation.

(b) A person who violates this chapter commits a Class C infraction.

As added by P.L.2-1991, SEC.7.