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Getting a muffler imported

funkymonkey
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funkymonkey Grand Master

funkymonkey

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Posted

I'm thinking of getting a muffler imported from japan (one of my mates is gonna send it to me) but I'm concerned about whether it'd be legal to use in Australia.

Its basically a muffler with a butterfly valve in it, and a remote control that activates it. Its got a circuit that hooks up to the car's readings and as soon as you hit a preset RPM (set by a potentiometer installed anywhere you want) or a manual override switch. Both of these open and close the valve. In the closed position its pretty quiet (so my jap friend says) and when the valve opens you get a purring noise.

I've fondly called it the variable fart muffler.

What do I need to do to make sure its legal, and when i ake it in for testing will they test both positions of the valve?

Here's some stats:

Weight - 3.5Kg

Inner pipe diameter - 54Ø or 60.3Ø

Shell size - 127Ø, 342mm length

Tail tip diameter - 89Ø

Material - Stainless steel 304

Effect - Reduces the engine sound pressure level by 5 to 8dB

An example:

Installed on a Hyundai coupe (dun ask why a jap guy is driving around in a Hyundai, you'll just confuse yourself)

@ 6700 rpm - Closed 89dB/Open 97dB

@ 4000 rpm - Closed 81dB/Open 89dB

What do you guys reckon? should I get one in for testing?

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  • 7 years later...
mad082 Grand Master

mad082

Posted
Posted

i think you also need to find out how exactly they are going to test the exhaust level. sitting the car on the spot and revving it isn't the proper way, yet it is the most common way they test it. the proper way to test it is with a driveby test, which is supposed to be done with the car accelerating from 60kmh in 3rd or something like that.

saliya Rising Star

saliya

Posted
Posted
I'm thinking of getting a muffler imported from japan (one of my mates is gonna send it to me) but I'm concerned about whether it'd be legal to use in Australia.

Its basically a muffler with a butterfly valve in it, and a remote control that activates it. Its got a circuit that hooks up to the car's readings and as soon as you hit a preset RPM (set by a potentiometer installed anywhere you want) or a manual override

Hey,

Each state is different, but I think you'll find that unless the vehicle was fitted with such a system in the first place (weren't R34 GTTs?) it's very likely to be illegal.

For example,

http://www.environment.nsw.gov.au/noise/ve...ise.htm#exhaust states

"The Regulation also makes it an offence to use temporary noise reduction devices or packing on vehicle exhausts. This includes items such as baffles in the exhaust system that have not been welded/riveted in place, or items that are adjustable such as valves"

If the car passes with the valve fully open there's no temporary noise reduction; so that _might_ be a way to get a car engineered with one of them fitted.

I would ask the relevant authorities in the states where you intend to drive the car first.

Regards,

Saliya

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