Secondary cat delete UK
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Joined: Jul 2019
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From: UK
C63S
Secondary cat delete UK
Anyone know where I can get a secondary cat delete in the UK? MSL just offer the decat pipes. 2019 facelift, though I don't think that will make much difference will it.
Junior Member
Joined: Sep 2020
Posts: 35
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From: UK
A205 C63s Convertible
These guys http://www.fastroadconversions.co.uk/ are based in Kent.
£240 to gut them or £480 to replace with switchable pipes for MOT time.
I think they are fully booked until 2021 now so be quick if you want to get booked in.
£240 to gut them or £480 to replace with switchable pipes for MOT time.
I think they are fully booked until 2021 now so be quick if you want to get booked in.
Junior Member
Joined: Sep 2020
Posts: 35
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From: UK
A205 C63s Convertible
Yeah I’m near Cambridge so they aren’t exactly close to me either. Just got the car last month so also considering having it done, that’s why I got that quote.
They said you’d have to gut them or switch them back in to get through an MOT because if they aren’t there at all it can be failed on that basis alone regardless of emissions.
They said you’d have to gut them or switch them back in to get through an MOT because if they aren’t there at all it can be failed on that basis alone regardless of emissions.
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Thread Starter
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From: UK
C63S
Because I'm a car guy and I know this stuff. However, I'm kinda thinking about what you said and having them replaceable will be better for resale. I'll call them Monday and see if they will do that, otherwise I might take a trip to Kent.
Thread Starter
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C63S
Junior Member
Joined: Sep 2020
Posts: 35
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From: UK
A205 C63s Convertible
No I'm worried about getting through MOT as you might have picked up!
I asked MSL about it and they said: We are sure that the decat and sports cat options we can provide will be applicable to your variant, a decat will delimit the exhaust allowing us to achieve a better exhaust note with additional power once tuned, this however will not pass an MOT from a rigorous tester based on emissions, a sports cat however will pass and like a decat comes with power and noise enhancement benefits although the overall gains are slightly inferior to those achieved with a decat exhaust by around 10 bhp.
Think he was referring to full de-cat of primary and secondary there though.
I asked MSL about it and they said: We are sure that the decat and sports cat options we can provide will be applicable to your variant, a decat will delimit the exhaust allowing us to achieve a better exhaust note with additional power once tuned, this however will not pass an MOT from a rigorous tester based on emissions, a sports cat however will pass and like a decat comes with power and noise enhancement benefits although the overall gains are slightly inferior to those achieved with a decat exhaust by around 10 bhp.
Think he was referring to full de-cat of primary and secondary there though.
Last edited by randlelwa; Oct 24, 2020 at 06:38 AM.
Thread Starter
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C63S
Aye, they are saying their sports cats will pass an MOT. I'm not sure about that tbh, but I'm pretty sure the original primaries will. I know a few testers, one even owns a Merc indie and they all pass with primaries only as did my GTR. However, for resale a nice tidy job with removable pieces would look a lot better than pieces welded in.
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C63
If yours is a 2019 facelift I would expect it to have the GPF/OPF filters where the secondary cats use to be on the pre facelift car. If you remove them the car will throw an error and you need to get a remap to sort it. Unfortunately you can’t just remove them and you the will need the sensors that plug into the filters tied up and covered.
I would speak to MSL as they will have done this before.
If you go for a full decat you will need to drop the gearbox or cut the original pipes.
I would speak to MSL as they will have done this before.
If you go for a full decat you will need to drop the gearbox or cut the original pipes.
Last edited by Scotty28c; Oct 25, 2020 at 10:52 AM.
Thread Starter
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From: UK
C63S
If yours is a 2019 facelift I would expect it to have the GPF/OPF filters where the secondary cats use to be on the pre facelift car. If you remove them the car will throw an error and you need to get a remap to sort it. Unfortunately you can’t just remove them and you the will need the sensors that plug into the filters tied up and covered.
I would speak to MSL as they will have done this before.
If you go for a full decat you will need to drop the gearbox or cut the original pipes.
I would speak to MSL as they will have done this before.
If you go for a full decat you will need to drop the gearbox or cut the original pipes.
I spoke to MSL and they were only interested in selling me decats with a tune.
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C63
Just do a search on google about GPF/opf removal and you will see loads of posts on it.
If your car is the facelift with the new digital dash you have opf filters.
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C63S
If your car has opf/GPF it will 100% have sensors that control it. The sensors measure the filters and trigger the regens like they do in a dpf for diesels. If you remove it then it will trigger an error the cel light on the dash. BMWs go into limp mode when they are removed and not remapped out. If you cut them out you will have to remap it.
Just do a search on google about GPF/opf removal and you will see loads of posts on it.
If your car is the facelift with the new digital dash you have opf filters.
Just do a search on google about GPF/opf removal and you will see loads of posts on it.
If your car is the facelift with the new digital dash you have opf filters.
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C63
Only trying help you, no need to get funny.. I know your car is not BMW it was only an example. You cannot remove a GPF on any car without an error. If you get them cut out next week let us know how you get on, hopefully it will only give your an engine management light and not go into limp mode..
https://www.onlyrevo.com/blog/gpf-ga...at-does-it-do/ (and yes I know it’s not a vw!
https://www.onlyrevo.com/blog/gpf-ga...at-does-it-do/ (and yes I know it’s not a vw!
Thread Starter
Senior Member
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From: UK
C63S
Only trying help you, no need to get funny.. I know your car is not BMW it was only an example. You cannot remove a GPF on any car without an error. If you get them cut out next week let us know how you get on, hopefully it will only give your an engine management light and not go into limp mode..
https://www.onlyrevo.com/blog/gpf-ga...at-does-it-do/ (and yes I know it’s not a vw!
https://www.onlyrevo.com/blog/gpf-ga...at-does-it-do/ (and yes I know it’s not a vw!
https://mbworld.org/forums/c63-c63s-...c63-coupe.html
Newbie
Joined: Jun 2020
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C63
Dude, there are loads of people with catted pipes on FL cars and no CEL, so secondaries removed, like I said, do a search. Only CEL is from the primaries and it's solved with spacers. There is no sensor post WLTP. Plenty of info on it!
https://mbworld.org/forums/c63-c63s-...c63-coupe.html
https://mbworld.org/forums/c63-c63s-...c63-coupe.html
Let us know how the car is after you get them cut out. Hopefully it will all be good and you have nothing to worry about.
Thread Starter
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Posts: 426
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From: UK
C63S
Happy to be proven wrong, as I said was only trying to help. Maybe Mercedes do it differently however all the uk cars that I know off that have had GPF removed have needed the map.
Let us know how the car is after you get them cut out. Hopefully it will all be good and you have nothing to worry about.
Let us know how the car is after you get them cut out. Hopefully it will all be good and you have nothing to worry about.
Tyres rubbing
Dropped a parcel on fridge door and dented it
Rear canard flicks don't fit (too big)
Broke a hub cap
Broke the hub cap spanner
Few beers I think..
Newbie
Joined: Jun 2020
Posts: 8
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C63
Big slice of humble pie coming your way. Can't be done in the UK without a tune! Two pipes either side and sensors galore, so staying standard. Just about tops my day off!
Tyres rubbing
Dropped a parcel on fridge door and dented it
Rear canard flicks don't fit (too big)
Broke a hub cap
Broke the hub cap spanner
Few beers I think..
Tyres rubbing
Dropped a parcel on fridge door and dented it
Rear canard flicks don't fit (too big)
Broke a hub cap
Broke the hub cap spanner
Few beers I think..
No need for humble pie, that’s what forums are for :-)
These cars are all different and I am sure there will be a way to remove the GPF without a map. They are a right pain the backside!!
Sorry to hear about all the other stuff going on, if it makes you feel any better I had to sell my W205 C63 coupe a couple of weeks back to pay for stamp duty on the new house. Man that hurts!!!
