GR Yaris Removal of GPF filter

Nishan

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May 24, 2022
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Hello all!

Local dumbass here again with another question :ROFLMAO:

If I replace the GPF Filter with a downpipe without it, is the ECU flash necessary? I got mixed messages, pertaining to "yes, you need to unless you want to stare at a dashboard light forever" and "no, no need. It won't show up on the dash"
 

Matt

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Dec 22, 2021
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No, absolutely not. The ECU doesn't care if there is a GPF fitted or not, it won't put a light on.
 

Nishan

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May 24, 2022
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Won't removal cause emissions problems come MOT time?
Yeah I'm wondering that aswell. Both of my current cars have full Akrapovic, which says on their website that it doesn't comply with the emission standards. However, they both passed MOT inspection, I didn't mention what kind of exhaust I am running, just that it was Akrapovic and it was homologated, and that was enough for them.
 
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Nishan

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May 24, 2022
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I wouldn't worry about an MOT at this stage, but more with the insurance company. Admiral told me it was a no-no after I asked if they'd confirm in writing I'd still be covered. So for me the GPF stays on.
Hello, would you be losing a lot of the sound if you kept the GPF on? For example only getting a cat-back, while retaining the original GPF, would the catback be quieter as a result?
 
D

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There is a very comprehensive exhaust test video on YouTube comparing various brand. They sound great and I'm pretty sure the GPF is in place.

Here you go:

 
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Bronson

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Dec 16, 2021
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Hello, would you be losing a lot of the sound if you kept the GPF on? For example only getting a cat-back, while retaining the original GPF, would the catback be quieter as a result?
Not at all, I have the Whifbitz on mine and it’s a lot louder than stock.

If I wanted a car without a GPF, I’d have bought something registered before 2018.
 

Steve

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Dec 7, 2021
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This has been covered multiple times on every car forum going, but…

GPF removal is illegal, an MOT failure, and uninsurable. You can’t insure it as a modification as it’s an illegal one, so technically you’re not insured.

But of course you can get an MOT without the GPF if they don’t detect it, which isn’t needed for 3 years anyway, and hope that if you are involved in an accident it doesn’t get found. The same as you can drive around uninsured, untaxed and without an MOT for months and get lucky. So it’s down to your personal risk aversion and law abidance.

Then there’s the moral/ethical debate on your contribution to local pollution and lung cancer…
 

Matt

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Dec 22, 2021
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Nice! How long have you been running without it? Do you think there will be issues come MOT time?
I have been running without it for about 6 months now. No issues. Yes it will fail an MOT in 3 years time unless you find a friendly tester.

Thats me and my car on the tegiwa video and you can see a comparison between GPF on and off towards the end 👍
 

Onehp

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Then there’s the moral/ethical debate on your contribution to local pollution and lung cancer…
Small correction, particles laden with cancerous compounds may come into the body through the lugns but they can cause all kinds of cancer.

And yes plenty of older (DI) cars around that don't have them, but it is not exactly progress if it was there and you choose to remove it. I'm glad I have mine and even notice the difference (sensitive lugns)
 

Michael Knight

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In Finland it was in the news that MOT will start having stricter control on removed OPF/GPF units and possibly fining owners if illegal removals were to be found. Common 'update' for older Diesel cars, but makes feeling sorry every time I see a smoking diesel car.

Not really sure if its really worth that extra 10hp given all the negatives it will bring. You will loose the feeling of that extra 10hp anyways in few days so not kind of worth it IMHO. . just drive harder..
 

Nishan

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May 24, 2022
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In Finland it was in the news that MOT will start having stricter control on removed OPF/GPF units and possibly fining owners if illegal removals were to be found. Common 'update' for older Diesel cars, but makes feeling sorry every time I see a smoking diesel car.

Not really sure if its really worth that extra 10hp given all the negatives it will bring. You will loose the feeling of that extra 10hp anyways in few days so not kind of worth it IMHO. . just drive harder..
Yeah I agree. I will just end up buying an GPF-back exhaust and be done with it. Regarding Diesel cars, in my country, specifically my area, there are all types of diesels, that smoke really hard when they step on the accelerator. Police won't do anything because they are afraid of these people ( I won't name-call here) as are the technical inspection guys. They pass them, but give us normal people a hard time. I have a fully homologated Akrapovič exhaust on both of my Renault Sports, and they always give me a hard time. But when Golf 4 GTI with a straight pipe comes in, everything is fine.
 

Matt

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Dec 22, 2021
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Yeah I agree. I will just end up buying an GPF-back exhaust and be done with it. Regarding Diesel cars, in my country, specifically my area, there are all types of diesels, that smoke really hard when they step on the accelerator. Police won't do anything because they are afraid of these people ( I won't name-call here) as are the technical inspection guys. They pass them, but give us normal people a hard time. I have a fully homologated Akrapovič exhaust on both of my Renault Sports, and they always give me a hard time. But when Golf 4 GTI with a straight pipe comes in, everything is fine.
Legality is a fair reason not to remove it, it doesn't worry me but I understand why it might other people. I wouldn't worry about the morality of it to be honest mate, its been debated here before.

a) It's a tiny percentage of petrol cars that have GPFs fitted anyway.
b) If people on here were really bothered about emissions they wouldn't be buying sports cars (or however you categorise the GR Yaris) and taking them on track/driving them for pleasure.

Just my opinion.
 
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Onehp

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Yeah each does as they please and without makes sense for a track build... for me there is no contradiction in enjoying driving and enjoying clean(er) air.... if not for others, for myself :D
 
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