Downpipes and stage 2 options for MY19/GPF cars

Fer16v

Active Member
Feb 2, 2020
65
18
Spain
Well... Imho, and as i read on your comments, the point of retaining GPF on Stage 3 will be the creation of a downpipe which holds an 200 or 300cel sport cat with stock GPF...until some top brand develops an "sport" or less restrictive GPF. Don't know (or haven't read yet) if someone took a stock DP, cutted the stock Cat, welded an sport one instead and dyno'ed it. That would be awesome and i'm sure it'll keep the car in its regular emissions levels passed ok with any problems at any Eu MOT.

Could REVO be working in something like this?

Regards
 

alper

Active Member
Feb 28, 2016
108
7
Well... Imho, and as i read on your comments, the point of retaining GPF on Stage 3 will be the creation of a downpipe which holds an 200 or 300cel sport cat with stock GPF...until some top brand develops an "sport" or less restrictive GPF. Don't know (or haven't read yet) if someone took a stock DP, cutted the stock Cat, welded an sport one instead and dyno'ed it. That would be awesome and i'm sure it'll keep the car in its regular emissions levels passed ok with any problems at any Eu MOT.

Could REVO be working in something like this?

Regards

Yes, I believe that would work great. I mean, it's already shown on stage 1 GPF cars that the GPF doesn't affect performance, if anything some make even more torque than before despite GPF's being on. Similarly for stage 2, the issue is the main catalyst. Replace this with a high-flow one and leave GPF's where they are and we should expect similar to pre-GPF gains there too. And I am sure there would be no MOT issues with such a solution.

But I can see where the difficulty lies with that: To keep costs reasonable, exhaust makers need to modify the stock exhausts / re-use GPFs, rather than throw them away completely. Before, there was only one expensive item and it was the one that needed replacing anyway: The main cat. So it was ok to completely throw it away and create the necessary piping around it.

Now, for MOT compatible solutions, if they throw away the GPF downpipe, they need to put back new dual GPFs which is a cost increase and a waste of money as they could have re-used the exact same stock ones, it's not at the GPF's where the gains are made. But for that to happen, it means they need to take the exhaust off each customer's car, modify it, and then put it back, so it can't be an off-the-shelf product like before (if you want to keep the cost down), it's more complicated.
Also, why would I pay for an exhaust with new GPF's when we know their restriction is minimal, instead of re-using mine. Maybe a custom solution as you described: take exhaust off, replace only main cat, put back, is the best value for money option. Can't think of much else.
 

Fer16v

Active Member
Feb 2, 2020
65
18
Spain
Yes, I believe that would work great. I mean, it's already shown on stage 1 GPF cars that the GPF doesn't affect performance, if anything some make even more torque than before despite GPF's being on. Similarly for stage 2, the issue is the main catalyst. Replace this with a high-flow one and leave GPF's where they are and we should expect similar to pre-GPF gains there too. And I am sure there would be no MOT issues with such a solution.

But I can see where the difficulty lies with that: To keep costs reasonable, exhaust makers need to modify the stock exhausts / re-use GPFs, rather than throw them away completely. Before, there was only one expensive item and it was the one that needed replacing anyway: The main cat. So it was ok to completely throw it away and create the necessary piping around it.

Now, for MOT compatible solutions, if they throw away the GPF downpipe, they need to put back new dual GPFs which is a cost increase and a waste of money as they could have re-used the exact same stock ones, it's not at the GPF's where the gains are made. But for that to happen, it means they need to take the exhaust off each customer's car, modify it, and then put it back, so it can't be an off-the-shelf product like before (if you want to keep the cost down), it's more complicated.
Also, why would I pay for an exhaust with new GPF's when we know their restriction is minimal, instead of re-using mine. Maybe a custom solution as you described: take exhaust off, replace only main cat, put back, is the best value for money option. Can't think of much else.

Alper

I struggled with that solution since i searched to upgrade my turbo and didn't want to get mad about it. Even i was convinced at a time to keep the OEM downpipe with an hybrid turbo pushing hard. But temps issues would be insurmountable and at that point, i got stuck between a decat-deGpf option....or just going to a "simple" stage 1...

Sadly, i think our best choice is to keep waiting. But keep in mind one thing. Same manner i have to cut my stock exhaust (pipes) to fit a Remus cat back, could cut my stock cat to fit a sport one instead and keep it for a lifetime....couldn't i?? Time will give us the answer. Hope main exhaust manufacturers are arguing this same issue at a time. Maybe REVO HQ could answer our prayers.....hahahhaa!!!

Regards .
 

CupraRST

Active Member
Feb 25, 2020
116
52
NL
Are there still no downpipes with sport cat (100 or 200 cell) that connects to the OEM GPF's?
Does anyone knows an exhaust specialist that is developing this?
 

alper

Active Member
Feb 28, 2016
108
7
Are there still no downpipes with sport cat (100 or 200 cell) that connects to the OEM GPF's?
Does anyone knows an exhaust specialist that is developing this?

Nope, and doesn't look like anything will come out really after the latest evolution from REVO that developed that fake stage 2 GPF (more like a stage 1+ in reality) on the stock downpipe (lol).
Solution is either to go for that for a bit extra power than stage 1, or remove the GPF completely and fit Milltek's GPF-less downpipe with the MOT risk it brings...
 
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CupraRST

Active Member
Feb 25, 2020
116
52
NL
Nope, and doesn't look like anything will come out really after the latest evolution from REVO that developed that fake stage 2 GPF (more like a stage 1+ in reality) on the stock downpipe (lol).
Solution is either to go for that for a bit extra power than stage 1, or remove the GPF completely and fit Milltek's GPF-less downpipe with the MOT risk it brings...

I'm afraid you are right. I was hoping for the Revo stage 2 tune, but they left the downpipe stock. Instead I went for a custom TVS tune myself, leaving the entire exhaust plus intercooler stock. With good results, see my review (link is in my signature).
But I keep on hoping for a downpipe for the next level, maybe when Revo or others go to stage 3......
 

CupraRST

Active Member
Feb 25, 2020
116
52
NL
HJS Motorsport has introduced two new downpipes:

For AWD/4Drive VAG cars with the 2.0 EA888 DNUE engine (with 2 GPFs):
https://www.hjs-motorsport.de/files/hjs/bilder/ece-downpipes/90 82 1135_Cupra.jpg

For FWD VAG cars with the 2.0 EA888 DNUE engine (with GPF):
https://www.hjs-motorsport.de/files/hjs/bilder/ece-downpipes/90 82 1160_TCR.png

On their YouTube channel you can find a couple of videos about this project:
https://www.youtube.com/channel/UCxVzRpPIE85srpAbUC3pKFA

They're quite expensive, but as far as I know these are the only ones available with improved GPFs, next to improved 200 cell cat, while keeping it legal. They look very professional made, pity you can't see that anymore when mounted.

I think it will be too soon that someone has already bought and tried this out, but I'm very curious and interested about it. Will it work? They claim a 3-5% gain in power on a stock car. I wonder if this will be different on an already stage 1 tuned car, without further map corrections, or after?

They also claim a bit firmer exhaust sound and a lower turbo temperature.

So please share your thoughts, thank you.
 
Last edited:

CupraRST

Active Member
Feb 25, 2020
116
52
NL
HJS Motorsport has introduced two new downpipes:

For AWD/4Drive VAG cars with the 2.0 EA888 DNUE engine (with 2 GPFs):
https://www.hjs-motorsport.de/files/hjs/bilder/ece-downpipes/90 82 1135_Cupra.jpg

For FWD VAG cars with the 2.0 EA888 DNUE engine (with GPF):
https://www.hjs-motorsport.de/files/hjs/bilder/ece-downpipes/90 82 1160_TCR.png

On their YouTube channel you can find a couple of videos about this project:
https://www.youtube.com/channel/UCxVzRpPIE85srpAbUC3pKFA

They're quite expensive, but as far as I know these are the only ones available with improved GPFs, next to improved 200 cell cat, while keeping it legal. They look very professional made, pity you can't see that anymore when mounted.

I think it will be too soon that someone has already bought and tried this out, but I'm very curious and interested about it. Will it work? They claim a 3-5% gain in power on a stock car. I wonder if this will be different on an already stage 1 tuned car, without further map corrections, or after?

They also claim a bit firmer exhaust sound and a lower turbo temperature.

So please share your thoughts, thank you.
The above mentioned links to the HJS Motorsport site are no longer working. Here are new links:

For AWD/4Drive VAG cars with the 2.0 EA888 DNUE engine (with 2 GPFs):
https://hjs-motorsport.de/products/downpipes/90-82-1135-2

For FWD VAG cars with the 2.0 EA888 DNUE engine (with GPF):
https://hjs-motorsport.de/products/downpipes/90-82-1160

These downpipes with GPF('s) are available for a while now, does anyone already have experiences with it?
 
Last edited:
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