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Exhaust rules and regulations
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Old 17-03-2015, 04:48 AM
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Default Exhaust rules and regulations

Hey all,

I am in QLD, need to buy a new exhaust as mine is about to rust through.

I am trying to determine what is legal and what is not, so far I can find nothing restricting size even though some people say it is illegal to increase exhaust size?

I know you have to keep a catalytic computer as stated 'Where alternative exhaust systems are fitted, the system must incorporate any engine emission
control equipment, meeting the same standard, as that fitted in the exhaust system of the vehicle.'

I dont want to run a rear muffler but I want to get a 3 inch system with a 200cel catalytic converter. I have an exhaust shop telling me it is illegal to remove the muffler from the system, this is news to me, I cut out my stock mufflers ages ago.

Does anyone know what the deal is? I was under the impression as long as the vehicle produced less than the specified dB level of noise it was legal. From what I can gather people using straight through systems with cats dont exceed this level as the turbo mufflers the sound significantly compared to NA engines which are loud as hell without mufflers.

Are my assumptions correct?

Also heard that moving the position of the cat from straight after the dump like some aftermarket systems is illegal, however I can find nothing to back this up.

Cheers,
Shorty

PS I am looking at getting a 3 inch aluminised system from 4x4factory direct on the gold coast for $880 delivered this special ends at the end of march if anyone else wants to get in on it. http://www.factorydirect4x4exhausts....xhaust-system/
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  #2  
Old 17-03-2015, 06:41 AM
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Yeah by law you must have a catalytic converter and rear muffler. The exhaust shop is rite. Beaudesert for example wont sell you a exhaust without cat or muffler. But will supply the muffler delete pipe if you want. With cat and muffler it wont be much louder then the stock system. But will have more turbo whistle. If you want a tuff diesel sound. Dont fit a muffler
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Old 17-03-2015, 07:33 AM
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I cannot find anywhere stating that you must fit a muffler, where are people getting this info from? Keeping a catalytic converter is clearly stated however
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Old 17-03-2015, 07:47 AM
Leprechaun Leprechaun is offline
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Quote:
Originally Posted by Shorty4655 View Post
I cannot find anywhere stating that you must fit a muffler, where are people getting this info from? Keeping a catalytic converter is clearly stated however
You have already posted the answer to your question.

'Where alternative exhaust systems are fitted, the system must incorporate any engine emission control equipment, meeting the same standard, as that fitted in the exhaust system of the vehicle.'

A rear muffler is part of the engine emission control equipment. Your argument on making more or less noise is arbitrary.
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Old 17-03-2015, 07:57 AM
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Now this is a hard thread to give a correct answer. You cannot exceed 98db with a delete pipe legally. Mine with the Beau roars as well as the induction noise. I will check and the portal and report back.
hj
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Old 17-03-2015, 08:04 AM
SPALDING SPALDING is offline
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Quote:
Originally Posted by Leprechaun View Post
You have already posted the answer to your question.

'Where alternative exhaust systems are fitted, the system must incorporate any engine emission control equipment, meeting the same standard, as that fitted in the exhaust system of the vehicle.'

A rear muffler is part of the engine emission control equipment. Your argument on making more or less noise is arbitrary.
How does a muffler control engine emissions?it only muffles noise.
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Old 17-03-2015, 08:11 AM
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Now this is a hard thread to give a correct answer. You cannot exceed 98db with a delete pipe legally. Mine with the Beau roars as well as the induction noise. I will check and the portal and report back.
hj
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Old 17-03-2015, 08:21 AM
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Okay guy's no delete pipe is fitted due to the noise, being loud transport may get you. I'll have a better look tomorrow
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Old 17-03-2015, 09:31 AM
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Quote:
Originally Posted by SPALDING View Post
How does a muffler control engine emissions?it only muffles noise.
Noise is an emission
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Old 17-03-2015, 09:37 AM
Leprechaun Leprechaun is offline
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Originally Posted by bods View Post
Noise is an emission
Yep, it rooly is.
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