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Timbrage: Engage
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5,658 Posts
Discussion Starter #1
I'm really getting sick of my quiet exhaust on my '99, I've always had duals on my trucks, I got a quote from our local Muffler Man, $150 for cat back duals/no mufflers, that's what I've run on my last 3 FSC's, but they've been OBS, will my NBS be happy with this setup?

my '94 had cat-back duals with no cats or mufflers and it was fuckin' loud as hell, could be hears up to 2 miles away on a clear night, so loud doesn't bother me
 

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Mayhem, Like Me
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3,087 Posts
PUT MUFFLERS ON IT.... at least put something... some dynomax bullets will give you a lot of sound and they are cheap. sounds like you just want loud Vs performance.
 

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I CANT SPELL GET OVER IT
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1,705 Posts
if you have good computer speekers turn them up if not turm them down allot of low tone from the mufflers in the clips
th_2006gmcflowmaster.gif

th_mytruck1994.gif



Section 257.707

Jump to the first occurrence of "muffler"

MICHIGAN VEHICLE CODE (EXCERPT)
Act 300 of 1949


257.707 Muffler, engine, power mechanism, and exhaust system; requirements; prohibitions.

Sec. 707.

(1) A motor vehicle, including a motorcycle or moped, shall at all times be equipped with a muffler in good working order and in constant operation to prevent excessive or unusual noise and annoying smoke. A person shall not remove, destroy, or damage any of the baffles contained in the muffler, nor shall a person use a muffler cutout, bypass, or similar device upon a motorcycle or moped on a highway or street.

(2) The engine and power mechanism of a motor vehicle shall be so equipped and adjusted as to prevent the escape of excessive fumes or smoke.

(3) A motor vehicle shall at all times be equipped with a properly operating exhaust system which shall include a tailpipe and resonator on a vehicle where the original design included a tailpipe and resonator.


History: 1949, Act 300, Eff. Sept. 23, 1949 ;-- Am. 1969, Act 134, Imd. Eff. June 1, 1970 ;-- Am. 1976, Act 44, Imd. Eff. Mar. 17, 1976 ;-- Am. 1976, Act 439, Imd. Eff. Jan. 13, 1977
 

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Timbrage: Engage
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5,658 Posts
Discussion Starter #4
PUT MUFFLERS ON IT.... at least put something... some dynomax bullets will give you a lot of sound and they are cheap. sounds like you just want loud Vs performance.
is there honestly any advantage in putting mufflers on it? like I said, that's the setup I ran on the last 3 trucks
 

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Mayhem, Like Me
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3,087 Posts
you are going to make some obnoxious noise and lose power without them... what do I know though.
 

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2,903 Posts
I'll second the thought to run dynomax bullets. AND, please, no chrome tips. Dump behind the axle, not before, also.

no mufflers is illegal, sounds like total ass (on all trucks, especially NBS's), and IIRC the NBS's don't like this setup too much:think:.

Big chrome tips = :doublepuk::superredneck::supergay:
 

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HOT AIR BALLOON OWNER
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14,932 Posts
Yeah, run some sort of muffling device.
 

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Timbrage: Engage
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5,658 Posts
Discussion Starter #8
I'll second the thought to run dynomax bullets. AND, please, no chrome tips. Dump behind the axle, not before, also.

no mufflers is illegal, sounds like total ass (on all trucks, especially NBS's), and IIRC the NBS's don't like this setup too much:think:.

Big chrome tips = :doublepuk::superredneck::supergay:

if no mufflers was illegal, I'm willing to bet that they wouldn't quote prices for it over the phone :hmm:


BTW, I'm a *******, and I like my stainless tips :pow:
 

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Mayhem, Like Me
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3,087 Posts
sounds like you dont need our help then figuring out what you want... we all offered advice on how to make it better and still give you something like what you want... post up some sound clips when you are done :LOL:
 

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Minitrucker
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710 Posts
I think you should do something that makes sense, unless you are going to do a true dual out, meaning long pipe headers, two precats, two full flow cats, two mufflers, the why don't you just put a THRUSH 2 1/2 input/output 28" long glasspack on it, it costs 20 bucks, and another 30 to have it welded in, it sounds really good, and its about 50 bucks. I will probably get flamed about my opinion, but thats what I am running, and I get alot of compliments, until people find out I only spent 50 bucks, then they get all pissy cause they just spent 300-500 bucks on a catback. but your call.... I am telling you though give it a shot it's inexpensive and it sounds really good!
 

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if no mufflers was illegal, I'm willing to bet that they wouldn't quote prices for it over the phone :hmm:


BTW, I'm a *******, and I like my stainless tips :pow:
Get your mufflers removed...then go to the police station, find the highest ranking person you don't know, and tell them you just had your mufflers removed. Report back afterwards...

Nothing wrong with being a *******...but IMO (and the opinion of a lot of other peeps on these boards) a clean ass is a beautiful thing.

but :word: if you've already got your mind up why are you asking us?
 

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Registered
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5,528 Posts
NBS need some back pressure. A bullet will make you happy. Single or dual. And I do support the tips.
 

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Mayhem, Like Me
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3,087 Posts
back pressure... bad

velocity and scavenging.... good...

-there's a difference
 

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Been there, broke that
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76 Posts
lol, great thread:drool:

Why don't you just keep the stock exhaust for normal driving, then when you want annoy the piss out of the world crack open some cut-outs? That would seem like the best answer to fit your noisy needs.
 

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Mayhem, Like Me
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3,087 Posts
:endofshow
 

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I CANT SPELL GET OVER IT
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1,705 Posts
h20son READ THE CODES ARE ALL UPDATED AS OF 01/15/2007 and as for quoting a price its all on you they are in it for money my 1994 has a cut out and flanged cats so i can take them out but it is not leagal in california i paid for it and they did it!!!!!!!!!!!!!
____________________________________________________________________________________________________________________________________________________
Section 257.707

Jump to the first occurrence of "muffler"

MICHIGAN VEHICLE CODE (EXCERPT)
Act 300 of 1949


257.707 Muffler, engine, power mechanism, and exhaust system; requirements; prohibitions.

Sec. 707.

(1) A motor vehicle, including a motorcycle or moped, shall at all times be equipped with a muffler in good working order and in constant operation to prevent excessive or unusual noise and annoying smoke. A person shall not remove, destroy, or damage any of the baffles contained in the muffler, nor shall a person use a muffler cutout, bypass, or similar device upon a motorcycle or moped on a highway or street.

(2) The engine and power mechanism of a motor vehicle shall be so equipped and adjusted as to prevent the escape of excessive fumes or smoke.

(3) A motor vehicle shall at all times be equipped with a properly operating exhaust system which shall include a tailpipe and resonator on a vehicle where the original design included a tailpipe and resonator.


History: 1949, Act 300, Eff. Sept. 23, 1949 ;-- Am. 1969, Act 134, Imd. Eff. June 1, 1970 ;-- Am. 1976, Act 44, Imd. Eff. Mar. 17, 1976 ;-- Am. 1976, Act 439, Imd. Eff. Jan. 13, 1977
____________________________________________________________________________________________________________________________________________________

Section 257.707c

Jump to the first occurrence of "muffler"

MICHIGAN VEHICLE CODE (EXCERPT)
Act 300 of 1949


257.707c Noise limitations; prohibitions.

Sec. 707c.

(1) After April 1, 1978, a motor vehicle shall not be operated or driven on a highway or street if the motor vehicle produces total noise exceeding 1 of the following limits at a distance of 50 feet except as provided in subdivisions (b)(iii) and (c)(iii):

(a) A motor vehicle with a gross weight or gross vehicle weight rating of 8,500 pounds or more, combination vehicle with gross weight or gross vehicle weight ratings of 8,500 pounds or more.

(i) Ninety DBA if the maximum lawful speed on the highway or street is greater than 35 miles per hour.

(ii) Eighty-six DBA if the maximum lawful speed on the highway or street is not more than 35 miles per hour.

(iii) Eighty-eight DBA under stationary run-up test.

(b) A motorcycle or a moped:

(i) Eighty-six DBA if the maximum lawful speed on the highway or street is greater than 35 miles per hour.

(ii) Eighty-two DBA if the maximum lawful speed on the highway or street is not more than 35 miles per hour.

(iii) Ninety-five DBA under stationary run-up test at 75 inches.

(c) A motor vehicle or a combination of vehicles towed by a motor vehicle not covered in subdivision (a) or (b):

(i) Eighty-two DBA if the maximum lawful speed on the highway or street is greater than 35 miles per hour.

(ii) Seventy-six DBA if the maximum lawful speed on the highway or street is not more than 35 miles per hour.

(iii) Ninety-five DBA under stationary run-up test 20 inches from the end of the tailpipe.

(2) A dealer shall not sell or offer for sale for use upon a street or highway in this state a new motor vehicle manufactured after April 1, 1978, which produces a maximum noise exceeding the following limits:

(a) A motor vehicle with a gross vehicle weight rating of 8,500 pounds or more—83 DBA.

(b) A motorcycle or a moped—83 DBA.

(c) A motor vehicle not covered in subdivision (a) or (b)—80 DBA.

(3) A person shall not operate a vehicle on a highway or street if the vehicle has a defect in the exhaust system which affects sound reduction, is not equipped with a muffler or other noise dissipative device, or is equipped with a cutout, bypass, amplifier, or a similar device.

(4) A person, either acting for himself or herself or as the agent or employee of another, shall not sell, install, or replace a muffler or exhaust part that causes the motor vehicle to which the muffler or exhaust part is attached to exceed the noise limits established by this act or a rule promulgated under this act.

(5) A person shall not modify, repair, replace, or remove a part of an exhaust system causing the motor vehicle to which the system is attached to produce noise in excess of the levels established by this act, or operate a motor vehicle so altered on a street or highway.

(6) A dealer shall not sell a used or secondhand motor vehicle for use upon a street or highway which is not in compliance with this act.


History: Add. 1978, Act 73, Imd. Eff. Mar. 21, 1978 ;-- Am. 1978, Act 492, Imd. Eff. Dec. 1, 1978

____________________________________________________________________________________________________________________________________________________

Section 257.707d


Jump to the first occurrence of "muffler"

MICHIGAN VEHICLE CODE (EXCERPT)
Act 300 of 1949


257.707d Violations; penalties; liability; prima facie evidence.

Sec. 707d.

(1) A person who violates section 707c(2), (4), or (6) is guilty of a misdemeanor punishable by a fine of $100.00.

(2) A person who violates section 707b or 707c(1), (3), or (5) is responsible for a civil infraction.

(3) A person who, at the time of installation, knowingly installs a muffler or exhaust system which exceeds the decibel limits of this act shall be liable to the person who receives a citation for violation of 707c for the amount of not less than $100.00, plus reasonable attorney fees and court costs.

(4) If it is shown that the noise level of a motor vehicle is in excess of the DBA levels established in this act, that evidence shall be prima facie evidence that the motor vehicle was producing excessive noise in violation of this act.

(5) A violation of section 707c(4) or (6) by a dealer licensed under this act is prima facie evidence of a fraudulent act under section 249.


History: Add. 1978, Act 73, Imd. Eff. Mar. 21, 1978 ;-- Am. 1979, Act 66, Eff. Aug. 1, 1979
 

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Running without a muffler, just y-piped duals isn't too loud, it just sounds like a throaty flowmaster 40, OBS are way louder. Running w/o cats or muffler, now that will set off car alarms.
 

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back pressure... bad

velocity and scavenging.... good...

-there's a difference
Some back pressure is good at the lower rpm's because of the overlap in valve opening and closing. If there is too little pressure, the mix can seep out. Although, too much back pressure is something that happens too much, you CAN have too little. Need was the wrong word to use, but a header to pipe (only ) is not ideal.
 

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Timbrage: Engage
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5,658 Posts
Discussion Starter #20
well, thanks for all of the help (?) guys

I guess I don't understand how they can quote prices over the phone for cat back duals with no mufflers if it is illegal :think: just like if you were to call and ask how much it would cost to put a test pipe in place of your cat, they laugh at you and tell you that its extremely illegal and that shop could be fined in excess of $50,000 for doing the work

back pressure... bad

velocity and scavenging.... good...

-there's a difference
can you elaborate? I'm here to learn, what do I need?


Running w/o cats or muffler, now that will set off car alarms.
:word:
 
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