OPF/GPF Delete for 2019+ EU cars
Thread Starter
Newbie
Joined: Apr 2024
Posts: 8
Likes: 5
2019 C63s sedan
OPF/GPF Delete for 2019+ EU cars
Greetings!
Long time lurker here.
I have a MY 2019 C63s with the dreaded OPF/GPF ( EU model ) and I am looking to get some more volume out of my car.
Is there anyone here who has an EU spec car and has removed just the OPF/GPF ( located in the secondary cat ) - how big of a sound difference does it make on the facelift model?
I already have the EVM exhaust module which helps a bit but I feel like it is not enough and I am not interested in aftermarket downpipes with high flow cats.
I know the secondary cat delete has been discussed here multiple times but I have not managed to find a sound clip of it on an facelifted EU model.
Thanks
Long time lurker here.
I have a MY 2019 C63s with the dreaded OPF/GPF ( EU model ) and I am looking to get some more volume out of my car.
Is there anyone here who has an EU spec car and has removed just the OPF/GPF ( located in the secondary cat ) - how big of a sound difference does it make on the facelift model?
I already have the EVM exhaust module which helps a bit but I feel like it is not enough and I am not interested in aftermarket downpipes with high flow cats.
I know the secondary cat delete has been discussed here multiple times but I have not managed to find a sound clip of it on an facelifted EU model.
Thanks
Thread Starter
Newbie
Joined: Apr 2024
Posts: 8
Likes: 5
2019 C63s sedan
Greetings once again!
So, I decided to do the OPF delete ( I still have the stock primary cats on, OPF is in the secondary cat which was removed ) for my facelift and the car now sounds absolutely amazing, I would say it increased the sound about 30%.
The sound level is perfect now, there is no smell nor drone. Comfort mode is still very civilized but in sport+/race there is a massive difference.
In addition, it seems to me that EVM module makes much a bigger difference as well with the OPF / secondary cat delete.
For cars with OPF, it has to be removed from the software as well.
I absolutely recommend this modification.
So, I decided to do the OPF delete ( I still have the stock primary cats on, OPF is in the secondary cat which was removed ) for my facelift and the car now sounds absolutely amazing, I would say it increased the sound about 30%.
The sound level is perfect now, there is no smell nor drone. Comfort mode is still very civilized but in sport+/race there is a massive difference.
In addition, it seems to me that EVM module makes much a bigger difference as well with the OPF / secondary cat delete.
For cars with OPF, it has to be removed from the software as well.
I absolutely recommend this modification.
Last edited by FaceliftC63s; May 17, 2024 at 06:27 AM.
Newbie
Joined: Dec 2024
Posts: 1
Likes: 0
Do you have any photos how you did it?
Greetings once again!
So, I decided to do the OPF delete ( I still have the stock primary cats on, OPF is in the secondary cat which was removed ) for my facelift and the car now sounds absolutely amazing, I would say it increased the sound about 30%.
The sound level is perfect now, there is no smell nor drone. Comfort mode is still very civilized but in sport+/race there is a massive difference.
In addition, it seems to me that EVM module makes much a bigger difference as well with the OPF / secondary cat delete.
For cars with OPF, it has to be removed from the software as well.
I absolutely recommend this modification.
So, I decided to do the OPF delete ( I still have the stock primary cats on, OPF is in the secondary cat which was removed ) for my facelift and the car now sounds absolutely amazing, I would say it increased the sound about 30%.
The sound level is perfect now, there is no smell nor drone. Comfort mode is still very civilized but in sport+/race there is a massive difference.
In addition, it seems to me that EVM module makes much a bigger difference as well with the OPF / secondary cat delete.
For cars with OPF, it has to be removed from the software as well.
I absolutely recommend this modification.
Super Member
Joined: Nov 2007
Posts: 784
Likes: 135
From: UK
2021 C63S coupe
Greetings once again!
So, I decided to do the OPF delete ( I still have the stock primary cats on, OPF is in the secondary cat which was removed ) for my facelift and the car now sounds absolutely amazing, I would say it increased the sound about 30%.
The sound level is perfect now, there is no smell nor drone. Comfort mode is still very civilized but in sport+/race there is a massive difference.
In addition, it seems to me that EVM module makes much a bigger difference as well with the OPF / secondary cat delete.
For cars with OPF, it has to be removed from the software as well.
I absolutely recommend this modification.
So, I decided to do the OPF delete ( I still have the stock primary cats on, OPF is in the secondary cat which was removed ) for my facelift and the car now sounds absolutely amazing, I would say it increased the sound about 30%.
The sound level is perfect now, there is no smell nor drone. Comfort mode is still very civilized but in sport+/race there is a massive difference.
In addition, it seems to me that EVM module makes much a bigger difference as well with the OPF / secondary cat delete.
For cars with OPF, it has to be removed from the software as well.
I absolutely recommend this modification.
Also you wouldn't happen to have a before and after sound clip/ video ?
Thread Starter
Newbie
Joined: Apr 2024
Posts: 8
Likes: 5
2019 C63s sedan
As for the before vs after sound, I do not have anything which does it full justice as the stuff I have is recorded on different microphones. I will have to dig and see if I find something.
I'll attach a 5-second clip with pretty bad quality ( and slightly annoying background music ), it's the only one I have on hand ( after OPF delete ). I'll try to find something better.
Stock tune - no added pops & bangs.
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Thread Starter
Newbie
Joined: Apr 2024
Posts: 8
Likes: 5
2019 C63s sedan
I found 2 clips and put together a side to side comparison, the difference is actually quite big.
The first clip is a very old one of my car, driven in Sport+ and near full throttle ( and as a added bonus, my GF failing to activate Launch Control in the beginning lol ).
The second clip is after the OPF removal, with EVM module also activated. Sport+ with slightly below half throttle.
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Regarding emissions, I will have TÜV check in 6 months, will give you an update but It shouldn't be a problem ( as primary cats are still in place ). I had a custom solution made so if necessary, I can install the OPF's back with ease.
As for the before vs after sound, I do not have anything which does it full justice as the stuff I have is recorded on different microphones. I will have to dig and see if I find something.
I'll attach a 5-second clip with pretty bad quality ( and slightly annoying background music ), it's the only one I have on hand ( after OPF delete ). I'll try to find something better.
Stock tune - no added pops & bangs.
As for the before vs after sound, I do not have anything which does it full justice as the stuff I have is recorded on different microphones. I will have to dig and see if I find something.
I'll attach a 5-second clip with pretty bad quality ( and slightly annoying background music ), it's the only one I have on hand ( after OPF delete ). I'll try to find something better.
Stock tune - no added pops & bangs.
Hello again.
I found 2 clips and put together a side to side comparison, the difference is actually quite big.
The first clip is a very old one of my car, driven in Sport+ and near full throttle ( and as a added bonus, my GF failing to activate Launch Control in the beginning lol ).
The second clip is after the OPF removal, with EVM module also activated. Sport+ with slightly below half throttle.
https://youtu.be/WG9FIb-5BHo?si=5gdyExv_jt72xLlD
I found 2 clips and put together a side to side comparison, the difference is actually quite big.
The first clip is a very old one of my car, driven in Sport+ and near full throttle ( and as a added bonus, my GF failing to activate Launch Control in the beginning lol ).
The second clip is after the OPF removal, with EVM module also activated. Sport+ with slightly below half throttle.
https://youtu.be/WG9FIb-5BHo?si=5gdyExv_jt72xLlD
Super Member
Joined: Nov 2007
Posts: 784
Likes: 135
From: UK
2021 C63S coupe
Hello again.
I found 2 clips and put together a side to side comparison, the difference is actually quite big.
The first clip is a very old one of my car, driven in Sport+ and near full throttle ( and as a added bonus, my GF failing to activate Launch Control in the beginning lol ).
The second clip is after the OPF removal, with EVM module also activated. Sport+ with slightly below half throttle.
https://youtu.be/WG9FIb-5BHo?si=5gdyExv_jt72xLlD
I found 2 clips and put together a side to side comparison, the difference is actually quite big.
The first clip is a very old one of my car, driven in Sport+ and near full throttle ( and as a added bonus, my GF failing to activate Launch Control in the beginning lol ).
The second clip is after the OPF removal, with EVM module also activated. Sport+ with slightly below half throttle.
https://youtu.be/WG9FIb-5BHo?si=5gdyExv_jt72xLlD
Newbie
Joined: Mar 2025
Posts: 1
Likes: 0
Greetings once again!
So, I decided to do the OPF delete ( I still have the stock primary cats on, OPF is in the secondary cat which was removed ) for my facelift and the car now sounds absolutely amazing, I would say it increased the sound about 30%.
The sound level is perfect now, there is no smell nor drone. Comfort mode is still very civilized but in sport+/race there is a massive difference.
In addition, it seems to me that EVM module makes much a bigger difference as well with the OPF / secondary cat delete.
For cars with OPF, it has to be removed from the software as well.
I absolutely recommend this modification.
So, I decided to do the OPF delete ( I still have the stock primary cats on, OPF is in the secondary cat which was removed ) for my facelift and the car now sounds absolutely amazing, I would say it increased the sound about 30%.
The sound level is perfect now, there is no smell nor drone. Comfort mode is still very civilized but in sport+/race there is a massive difference.
In addition, it seems to me that EVM module makes much a bigger difference as well with the OPF / secondary cat delete.
For cars with OPF, it has to be removed from the software as well.
I absolutely recommend this modification.
The sound is perfect!!
Howmuch did the modification cost in total? And what kind of software was needed for the opf?
