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This is very similar to the law passed in California. In short, no exhaust modification on 2013 and newer.
Please read and if you have a strong opinion on it, write your Representative(s). You can find your Rep very easy on the States website.
http://www.nh.gov/government/state.html
You can also look up this bill for yourself if you like. Be sure to change the year to 2012.
HB 1442 – AS INTRODUCED
2012 SESSION
12-2254
03/09
HOUSE BILL 1442
AN ACT relative to motorcycle noise emission regulation.
SPONSORS: Rep. Peckham, Rock 13; Rep. W. Smith, Rock 18; Rep. Waddell, Rock 15; Rep. Abrami, Rock 13
COMMITTEE: Transportation
ANALYSIS
This bill modifies exhaust requirements for motorcycles manufactured on or after January 1, 2013.
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Explanation: Matter added to current law appears in bold italics.
Matter removed from current law appears [in brackets and struckthrough.]
Matter which is either (a) all new or (b) repealed and reenacted appears in regular type.
12-2254
03/09
STATE OF NEW HAMPSHIRE
In the Year of Our Lord Two Thousand Twelve
AN ACT relative to motorcycle noise emission regulation.
Be it Enacted by the Senate and House of Representatives in General Court convened:
1 New Paragraph; Motorcycle Noise Levels; Applicability. Amend RSA 266:59-a by inserting after paragraph III the following new paragraph:
IV. The provisions of this section shall apply only to motorcycles manufactured before January 1, 2013.
2 New Section; Motorcycle Sound Emissions Regulation. Amend RSA 266 by inserting after section 59-a the following new section:
266:59-aa Motorcycle Sound Emissions Regulation.
I. No person shall operate or use a highway motorcycle registered in the state of New Hampshire and manufactured on or after January 1, 2013 unless the motorcycle is equipped with a factory installed exhaust system, or equivalent, that bears the required applicable federal Environmental Protection Agency exhaust system labels pursuant to 40 C.F.R. part 205, subparts D and E. The exhaust system shall not produce a sound level in excess of 82 decibels on the A scale when measured in accordance with federal testing procedures.
II. No person shall tamper with, remove, or render inoperative any part or component of the exhaust system or its component parts which cause the motorcycle to exceed 80 decibels on the A scale.
III. No person shall pass for the purposes of the inspection required by RSA 266:1 any motorcycle manufactured on or after the January 1, 2013, which does not comply with paragraph I and which exceeds a measured noise level of 82 decibels on the A scale using the federal testing procedure.
IV. Any person who violates the provisions of paragraph I or II shall be guilty of a violation and shall be fined not less than $350 for a first offense and $500 for any subsequent offence.
V. This section applies to a person operating a motorcycle that is newly manufactured on or after January 1, 2013, or a motorcycle with aftermarket exhaust system equipment that is newly manufactured on or after January 1, 2013. This section shall not apply to competition motorcycles.
4 Effective Date. This act shall take effect January 1, 2013.