So aparently the exhaust noise laws have chenged again?

[bbq1988]

All i can say is... Bugger

[MR2SIK]

I had a 3 inch downpipe off the turbo, into a 2.5 inch exhaust that headed straight to a hks cannon muffler, off boost and cruising around, it was quiet as, until someone decided to stick their foot in it and rip it off the mounts putting big holes in it, could only afford to replace it with an rps item at the time, now its significantly louder...

Moral is, I had an exhaust system barely a metre long into a quality muffler and it had all of the performance and about a 1/4 of the noise.
even if I manage to get another decent muffler, I still think it will fail a wof just because it looks like a loud exhaust...

[Boosted_162]

I had a 3 inch downpipe off the turbo, into a 2.5 inch exhaust that headed straight to a hks cannon muffler, off boost and cruising around, it was quiet as, until someone decided to stick their foot in it and rip it off the mounts putting big holes in it, could only afford to replace it with an rps item at the time, now its significantly louder...

Moral is, I had an exhaust system barely a metre long into a quality muffler and it had all of the performance and about a 1/4 of the noise.
even if I manage to get another decent muffler, I still think it will fail a wof just because it looks like a loud exhaust...

I have a gutted downpipe into a 3" exhaust, with 2 reso's and a muffler, 4.5" tip and mines damn quiet considering the exhaust is only just over a metre long.

[fivebob]

So what does the 95dB limit referred to in this article apply to??? WOF test or LVV Cert?

[Dell'Orto]

I had a 3 inch downpipe off the turbo, into a 2.5 inch exhaust that headed straight to a hks cannon muffler, off boost and cruising around, it was quiet as, until someone decided to stick their foot in it and rip it off the mounts putting big holes in it, could only afford to replace it with an rps item at the time, now its significantly louder...

Moral is, I had an exhaust system barely a metre long into a quality muffler and it had all of the performance and about a 1/4 of the noise.
even if I manage to get another decent muffler, I still think it will fail a wof just because it looks like a loud exhaust...

I have a gutted downpipe into a 3" exhaust, with 2 reso's and a muffler, 4.5" tip and mines damn quiet considering the exhaust is only just over a metre long.

In my SW I had 3" downpipe into 3" muffler into a 3" shiny bling cannon and it was quiet as The centre muffler I used was only about 200mm long, but wasnt straight through.

[MR2SIK]

yea thats the thing, all I have is the bling cannon at the end.
Manifold-Turbo- Downpipe-flexi-50-60cm of 2.5 inch pipe-cannon.
Difference to passing wofs without mention, to probably failing the next one is hks vs rps cannon

[escortman]

whats the difference between the grey and red ones?

um i cant member what my mate said ill find out

[IH8TEC]

my car is not legal, tested it today at work, 117db at 4k without silencer, 104db at abotu 3500 with silencer

88 at idle with silencer, without at idle is 102, inside the car at 3500 is 92db without the silencer. but i know for a fact when cruising it is quieter.

being around my car at 117db for more than 30sec causes permanent hearing damage, and at 88 after about 2-3hrs will cause permanent hearing damage

so from this, i'm going to try modify the silencer to quieten it down even more without restricting it too much.

[tsoob]

my car is not legal, tested it today at work, 117db at 4k without silencer, 104db at abotu 3500 with silencer

88 at idle with silencer, without at idle is 102, inside the car at 3500 is 92db without the silencer. but i know for a fact when cruising it is quieter.

being around my car at 117db for more than 30sec causes permanent hearing damage, and at 88 after about 2-3hrs will cause permanent hearing damage

so from this, i'm going to try modify the silencer to quieten it down even more without restricting it too much.

Thats awesome brendon i think you should get a bigger tip!!!

[IH8TEC]

i thought abotu turning on launch control, i reckon it would crack 140+ with the backfires

[kim0663]

LOL. Im gonna have lots of fun trying to get wof this month for the mr2.

"A vehicle is not fitted with an exhaust system that includes a means of sound reduction"

3" downpipe, 3" piping, straight out the back (no muffler) ... Quieter than a 20v with rps fitted trueno tho

[molex]

Would a turbo count as a method for reducing noise? They certainly do make a difference.

[Lloyd]

"Note 1 Exhaust system means a pipe assembly through which the engine exhaust gases pass to the atmosphere
and includes some means of sound reduction such as a silencer or resonator."

[kim0663]

"Note 1 Exhaust system means a pipe assembly through which the engine exhaust gases pass to the atmosphere
and includes some means of sound reduction such as a silencer or resonator."

Oh Oh! mines got like a tiny weeny resonator , doubt it will do crap all tho.

Who cares tho, Police don't exactly read and memorize the VIRM anyway.

[B1NZ]

My old car, I pulled hte CAT out, and it made it loud and droney, I put two Coby 19" in it, and it made it a bit quieter, took some of the drone, then put a big oval muffler on it, and it made it damn near silent.

whats the difference between the grey and red ones?

I think the grey ones are louvered resonators, they quiten the noise down a bit better than the red ones I think

[molex]

"Note 1 Exhaust system means a pipe assembly through which the engine exhaust gases pass to the atmosphere
and includes some means of sound reduction such as a silencer or resonator."

Exhaust gasses merge into a collector (Pipe) pass through the turbine assembly, reducing the noise and then on to atmosphere. I would hate to argue the point with a cop or a VTNZ tester but it seems to me like it fits.

[barryogen]

I actually think that this is all a good thing, I'm keen on exhaust's having to be quieter than 95dB, hell, anything above 85(common bus noise) is pretty damn loud to be next to, it's certainly loud enough that you can't even yell over the top of it.

[Leon]

I tested about 50 cars at two motorsport events, using a dba meter, and as near as possible to the "quick test" method in the book. One car was over (Group A Legacy), two cars were on the limit. All three were f@cking loud.

My standard Sti came in at a whopping 84 as I recall.

[~SlideWays~]

I tested about 50 cars at two motorsport events, using a dba meter, and as near as possible to the "quick test" method in the book. One car was over (Group A Legacy), two cars were on the limit. All three were f@cking loud.

My standard Sti came in at a whopping 84 as I recall.

Hey Leon what did did you use to test them? I'd be keen to see what my trueno is like. I specifically went out to set it up to flow well but be quiet.

The silencer is the main thing, 2.5" straight through but still quiet as possible. Its an "Ultraflow" from memory, just plain black/stealth

I only just had it wof'd so mustn't have been in effect yet because it was never mentioned. Have also just had the wastegate plumbed into the downpipe aswell so hopefully im sorted.

[MR2SIK]

my car is not legal, tested it today at work, 117db at 4k without silencer, 104db at abotu 3500 with silencer

88 at idle with silencer, without at idle is 102, inside the car at 3500 is 92db without the silencer. but i know for a fact when cruising it is quieter.

being around my car at 117db for more than 30sec causes permanent hearing damage, and at 88 after about 2-3hrs will cause permanent hearing damage

so from this, i'm going to try modify the silencer to quieten it down even more without restricting it too much.

Jeezuz Brendon, that puts my 107dB without Silencer to shame haha.
I just passed with a 97dB with the silencer in.


They still have the 2dB allowance for cars with the engine in the right place dont they?