NH Exhaust System Regulations

[ShelbyDodgeImp]

FYI in case anyone here lives here or is going to move here, I have learned over the course of this month that in this state you are required by state law to have a muffler.

That muffler has to be in the stock muffler location.

It has to use either chambers, bellow disks or both (can't be straight through).

There are no dB limits, but excessive volume/noise is illegal (there's no scientific way of saying what is or is not legal so you can get a ticket and have it stick just because the cop dislikes your vehicle). They were going to impose a 106 dB limit for bikes only, but that did not come to be.

It took days but the state got back to me and the local dealer and Supertrapps are legal because of their bellow disks, but most aftermarket glasspacks are not.

I don't know if any of you are in this state, but this maybe useful to anyone who is.

The actual text of the state law reads:

Quote:

259:66 Muffler. – ""Muffler'' shall mean a device consisting of a series of chambers or baffleplates or other mechanical design for the purpose of receiving exhaust gases and effectively reducing noise.

Quote:

266:59 Muffler; Prevention of Noise. – I. Every motor vehicle shall at all times be equipped with a muffler as defined in RSA 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. 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 [Repealed.]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 RSA 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.

Notice how much the fines climb. Yikes.

[GLHNSLHT2]

My turbocharger has chambers and baffles and removes noise