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  #11  
Old 09-15-2009, 09:31 PM
jim putman's Avatar
jim putman jim putman is offline
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This site will make your head hurt
http://apps.leg.wa.gov/RCW/default.aspx?cite=46.37


RCW 46.37.390
Mufflers required Smoke and air contaminant standards Definitions Penalty, exception.

(1) Every motor vehicle shall at all times be equipped with a muffler in good working order and in constant operation to prevent excessive or unusual noise, and no person shall use a muffler cut-out, bypass, or similar device upon a motor vehicle on a highway.

(2)(a) No motor vehicle first sold and registered as a new motor vehicle on or after January 1, 1971, shall discharge into the atmosphere at elevations of less than three thousand feet any air contaminant for a period of more than ten seconds which is:

(i) As dark as or darker than the shade designated as No. 1 on the Ringelmann chart, as published by the United States bureau of mines; or

(ii) Of such opacity as to obscure an observer's view to a degree equal to or greater than does smoke described in subsection (a)(i) above.

(b) No motor vehicle first sold and registered prior to January 1, 1971, shall discharge into the atmosphere at elevations of less than three thousand feet any air contaminant for a period of more than ten seconds which is:

(i) As dark as or darker than the shade designated as No. 2 on the Ringelmann chart, as published by the United States bureau of mines; or

(ii) Of such opacity as to obscure an observer's view to a degree equal to or greater than does smoke described in subsection (b)(i) above.

(c) For the purposes of this subsection the following definitions shall apply:

(i) "Opacity" means the degree to which an emission reduces the transmission of light and obscures the view of an object in the background;

(ii) "Ringelmann chart" means the Ringelmann smoke chart with instructions for use as published by the United States bureau of mines in May 1967 and as thereafter amended, information circular 7718.

(3) No person shall modify the exhaust system of a motor vehicle in a manner which will amplify or increase the noise emitted by the engine of such vehicle above that emitted by the muffler originally installed on the vehicle, and it shall be unlawful for any person to operate a motor vehicle not equipped as required by this subsection, or which has been amplified as prohibited by this subsection. A court may dismiss an infraction notice for a violation of this subsection if there is reasonable grounds to believe that the vehicle was not operated in violation of this subsection.
This subsection (3) does not apply to vehicles twenty-five or more years old or to passenger vehicles being operated off the highways in an organized racing or competitive event conducted by a recognized sanctioning body.
[2006 c 306 4; 2001 c 293 1; 1977 ex.s. c 355 33; 1972 ex.s. c 135 1; 1967 c 232 3; 1961 c 12 46.37.390. Prior: 1955 c 269 39; prior: 1937 c 189 36; RRS 6360-36; RCW 46.36.050; 1927 c 309 17; 1921 c 96 21; 1915 c 142 20; RRS 6362-17.]


Notes:
Rules of court: Monetary penalty schedule -- IRLJ 6.2.

Severability -- 1977 ex.s. c 355: See note following RCW 46.37.010.


Motorcycles and motor-driven cycles -- Additional requirements and limitations: RCW 46.37.539.
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  #12  
Old 09-15-2009, 11:01 PM
in2fords in2fords is offline
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so in washington under 25 years old you cant modify the exhaust to be any louder then original, vehicle over 25 years old can be modified but must have a muffler. that is a simple law, I like how that reads, atleast it is in black and white
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  #13  
Old 09-16-2009, 06:34 AM
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zukkev zukkev is offline
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Ouch Jim!!! My head hurts!!!
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  #14  
Old 09-16-2009, 08:00 AM
Art Waugh Art Waugh is offline
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Most OHV testing is at around 20-24 inches on an angle from the outlet, and I believe is 96 db, except for a few areas which are around 90-92 db, (dunes NRA for one).
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  #15  
Old 09-16-2009, 10:27 AM
thebenreilly thebenreilly is offline
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so maybe this is a dumb question because i'm not sure it's going to be too loud anyway.
if i run just one pipe it would be quiter than two pipes?
in my cj5 we just pointed the pipe towards the ground under the jeep to dampen noise, would that work in this case? my 5 didn't have headers on it.
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  #16  
Old 09-16-2009, 10:43 AM
Art Waugh Art Waugh is offline
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With any decent muffler you should be OK unless you are running a full race cam setup. If you are going to be using it for a trail rig you need to have a baffled muffler, straight thru glasspack won''t pass muster with the feds for spark arresting ability. If they can pass a wire or thin rod through the muffler, they can write a ticket for it.
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1981 Cherokee W/T, 360, T-18, Warn 8274 in custom bumper/deer strainer (tested and approved)

1988 Cherokee 4 door, 3" Rancho lift, custom sliders/steps, custom roof rack, custom camo paint, custom camo headliner, custom bumpers and Warn 9500 HS, 31-10.50's

Only 31's, but can drag self with either rig

BLM John Day/Snake RAC-OHV Representative

Wolfpack 4x4's - Region 5 - "Cave Lupum"

VP- Outcast Land Use Review Team
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  #17  
Old 09-16-2009, 07:56 PM
thebenreilly thebenreilly is offline
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i don't want glasspacks. just regular mufflers.
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