I. Every motor vehicle shall at all times be equipped with a muffler as defined in N.H. Rev. Stat. § 259:66, in good working order and in constant operation to prevent excessive or unusual noise, and no person shall use a muffler cutout, bypass or similar device upon a motor vehicle on a way.
II. The engine and power mechanism of every motor vehicle shall be so equipped and adjusted as to prevent the escape of excessive fumes, smoke, flame, gas, oil or fuel residue.

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Terms Used In New Hampshire Revised Statutes 266:59


III. [Repealed.]
IV. No person shall operate a motor vehicle with a straight pipe exhaust system; “straight pipe exhaust system” means any straight- through exhaust system that does not contain baffles or otherwise does not meet the definition of muffler in N.H. Rev. Stat. § 259:66. Any person who violates the provisions of this paragraph shall be guilty of a violation and shall be fined not less than $100 for a first offense, not less than $250 for a second offense in a calendar year, and not less than $500 for a third or subsequent offense in a calendar year.