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Author Topic: mk4 R32 exaust de-cat questions.  (Read 4899 times)

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Offline superfueler

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mk4 R32 exaust de-cat questions.
« on: February 18, 2020, 04:43:18 pm »
I'm hoping the fundi's might be able to help with a qustion.

If i decide to de-cat my R32's stock exaust (for obvious reasons, ie nicer clearer VR6 sound) then,

1. How can i keep the engine check light off?
2. Will it pass future WOF's with a de-cat stock exaust?
3. Any other loop holes to consider?

Cheers.
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Offline LouieP

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Re: mk4 R32 exaust de-cat questions.
« Reply #1 on: February 18, 2020, 05:46:28 pm »
It will fail if the check engine light is on from it. A tune would keep the light off and as far as I am aware cat deletes are not illegal in NZ (Not yet). I would go hi-flow cat, reso delete and flapper mod but wire it up to switch so you can close the valves if its too loud. I heard a 32 on instagram with this set up and it sounded great
« Last Edit: February 18, 2020, 05:49:56 pm by LouieP »
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Offline Brett

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Re: mk4 R32 exaust de-cat questions.
« Reply #2 on: February 18, 2020, 06:00:17 pm »
Quote from: LouieP on February 18, 2020, 05:46:28 pm
It will fail if the check engine light is on from it. A tune would keep the light off and as far as I am aware cat deletes are not illegal in NZ (Not yet). I would go hi-flow cat, reso delete and flapper mod but wire it up to switch so you can close the valves if its too loud. I heard a 32 on instagram with this set up and it sounded great
Cat deletes are illegal. Most testing stations just don't look/care until it's cracked down on one day
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Offline schattenblau

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Re: mk4 R32 exaust de-cat questions.
« Reply #3 on: February 18, 2020, 06:31:35 pm »
that day has come,

in the last round of VIRMs, no cat is a fail if;

2. A vehicle (other than group L vehicle or a class MA or MC motorsport vehicle with a valid motorsport authority card) that was first registered in New Zealand on or after 1 May 2010 and manufactured from 1 January 1990 has a catalytic converter (or diesel particulate filter (DPF) in the case of diesel powered vehicles) removed where there is evidence that one was originally fitted, and there is no written evidence issued by an entry certifier that the vehicle passed a prescribed metered emissions test in this condition


https://vehicleinspection.nzta.govt.nz/virms/in-service-wof-and-cof/general/exhaust/exhaust-emissions
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Offline LouieP

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Re: mk4 R32 exaust de-cat questions.
« Reply #4 on: February 18, 2020, 07:04:59 pm »
Quote from: Brett on February 18, 2020, 06:00:17 pm
Cat deletes are illegal. Most testing stations just don't look/care until it's cracked down on one day
Thanks for clearing that up, wont be long before they start getting strict on it. Also see you on Kalmia Street some days after work. Car has a nice subtle overrun
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Offline 80 Vert

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Re: mk4 R32 exaust de-cat questions.
« Reply #5 on: February 18, 2020, 09:36:45 pm »
About time too. Long overdue.
All these people just cutting their cats out, and we call ourselves clean and green. What a joke.
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Offline Naekyr

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Re: mk4 R32 exaust de-cat questions.
« Reply #6 on: February 19, 2020, 08:27:14 am »
Quote from: 80 Vert on February 18, 2020, 09:36:45 pm
About time too. Long overdue.
All these people just cutting their cats out, and we call ourselves clean and green. What a joke.

What are you even doing here then lol. Going decat was one of the first things I did, can't have proper pops/bangs and/or flames with it haha.

To answer questions.

Cat delete/ decat downpipe install is easy. It will pass a wof as they dont do emissions testing
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Offline McDoof

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Re: mk4 R32 exaust de-cat questions.
« Reply #7 on: February 19, 2020, 09:51:05 am »
That law has been in place for a long time. You can technically still decat your vehicle if it was first registered in NZ before 2010. So any imported cars that have come in since 2010 are not allowed to be done, but if your car is NZ new pre 2010 or imported prior to 2010, go for gold.

I had this conundrum when I had my 3.0R Legacy. Even though it was pre 2010 and NZ new I decided to keep 2 of the 3 cats. That was back in 2012.
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Offline schattenblau

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Re: mk4 R32 exaust de-cat questions.
« Reply #8 on: February 19, 2020, 10:41:34 am »
don't forget the jan 1 1990 build date.
that's going to catch a lot of imports.
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Offline McDoof

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Re: mk4 R32 exaust de-cat questions.
« Reply #9 on: February 19, 2020, 11:08:12 am »
Pretty sure that just means anything manufactured prior to 1990 is exempt from having a cat altogether.
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Offline superfueler

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Re: mk4 R32 exaust de-cat questions.
« Reply #10 on: February 23, 2020, 02:48:11 pm »
Quote from: 80 Vert on February 18, 2020, 09:36:45 pm
About time too. Long overdue.
All these people just cutting their cats out, and we call ourselves clean and green. What a joke.

You can call yourself green thanks. I am true BLUE.  8)
« Last Edit: February 23, 2020, 02:49:52 pm by superfueler »
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Offline 80 Vert

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Re: mk4 R32 exaust de-cat questions.
« Reply #11 on: February 23, 2020, 07:28:04 pm »
Never said I was green, law has been around for ages and it's about time they enforce it.
NZ is such a joke we don't even do emissions testing of any kind, unheard of in the civilised world.
Plenty of hi flow cat options out there which is what Ive always done when building performance stuff.
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Offline Naekyr

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Re: mk4 R32 exaust de-cat questions.
« Reply #12 on: February 23, 2020, 10:39:01 pm »
Quote from: 80 Vert on February 23, 2020, 07:28:04 pm
Never said I was green, law has been around for ages and it's about time they enforce it.
NZ is such a joke we don't even do emissions testing of any kind, unheard of in the civilised world.
Plenty of hi flow cat options out there which is what Ive always done when building performance stuff.

Having never tried a 200 cell cat, does it still sound like this or does it reduce the sound And/Or will it burn the cat?

https://www.youtube.com/watch?v=oIF1AbZGZ4w
« Last Edit: February 23, 2020, 10:44:50 pm by Naekyr »
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Offline 80 Vert

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Re: mk4 R32 exaust de-cat questions.
« Reply #13 on: February 24, 2020, 07:43:53 am »
That sounds horrible, never tried non cat vs hi flow. I've always just installed hi flow from the beginning so can't say sorry.
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Offline McDoof

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Re: mk4 R32 exaust de-cat questions.
« Reply #14 on: February 24, 2020, 09:39:02 am »
Quote from: Naekyr on February 23, 2020, 10:39:01 pm
Having never tried a 200 cell cat, does it still sound like this or does it reduce the sound And/Or will it burn the cat?

https://www.youtube.com/watch?v=oIF1AbZGZ4w
Why would you want to drive something that sounds like that?
You might as well through a pack of fire crackers out of your window every time you let off the accelerator.
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Offline Naekyr

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Re: mk4 R32 exaust de-cat questions.
« Reply #15 on: February 24, 2020, 12:26:02 pm »
Quote from: McDoof on February 24, 2020, 09:39:02 am
Why would you want to drive something that sounds like that?
You might as well through a pack of fire crackers out of your window every time you let off the accelerator.

Doesn't do it all the time, it can be enabled and disabled based on the gearbox profile, i.e. having it in aggressive sport.

No different to any other cars that have overrun, like the Audi RS3, which also enabled the bangs in Dynamic/Sport and disables it in Comfort.

« Last Edit: February 24, 2020, 12:28:21 pm by Naekyr »
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Offline Poonmobile

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Re: mk4 R32 exaust de-cat questions.
« Reply #16 on: February 24, 2020, 04:33:17 pm »
Quote from: superfueler on February 18, 2020, 04:43:18 pm
I'm hoping the fundi's might be able to help with a qustion.

If i decide to de-cat my R32's stock exaust (for obvious reasons, ie nicer clearer VR6 sound) then,

1. How can i keep the engine check light off?
2. Will it pass future WOF's with a de-cat stock exaust?
3. Any other loop holes to consider?

Cheers.

I had a millet decat pipe put on my old Mk4 R32, as i then installed a full miltek system (resonated)
I went for a tune to code out the CEL but also to help with that dreaded flat spot and to give me 'slightly' better fuel economy. Never had any issues with warrants in the 4+ years i had the car after this modification. (owned the car for @7 years)
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Offline Gordo

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Re: mk4 R32 exaust de-cat questions.
« Reply #17 on: February 25, 2020, 07:22:49 am »
You wouldn't, the cat stuff is new.
Personally, while I consider it decades overdue - should have been introduced when we went fully lead free - I do have a problem with it being retro-active, many older vehicles had their cat's removed perfectly legally and stinging them for replacements now would be a bit on the nose.
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Offline McDoof

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Re: mk4 R32 exaust de-cat questions.
« Reply #18 on: February 25, 2020, 02:31:44 pm »
Quote from: Gordo on February 25, 2020, 07:22:49 am
You wouldn't, the cat stuff is new.
Personally, while I consider it decades overdue - should have been introduced when we went fully lead free - I do have a problem with it being retro-active, many older vehicles had their cat's removed perfectly legally and stinging them for replacements now would be a bit on the nose.

They wouldn't do that. Only if the car is registered after may 2010 does this apply. Any cars registered prior to that exempt. The only thing that changed this year was the addition of Diesel DPF to the same law.
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Offline Gordo

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Re: mk4 R32 exaust de-cat questions.
« Reply #19 on: February 26, 2020, 08:24:16 am »
So you're claiming no-one in the last ten years legally, under the legislation then in place, removed the cat' on their vehicle...
Yeah, right...
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