Removing primary cats ONLY and keeping secondary cats/resonators - anyone does this?
Thread Starter
Member
Joined: Nov 2011
Posts: 117
Likes: 0
From: London
C63 Estate
Removing primary cats ONLY and keeping secondary cats/resonators - anyone does this?
Hi all,
I've watched loads of videos of people who have removed secondary cats and or resonators. To me, personally, a lot sound really raspy and un-refined, more like a shouting car rather than a deep rumbling puuurrrrr.
I just watched this video, I think, going from description, guy has just removed his primary cats and left the rest, sounds really nice, same noise, just deeper, see here:
My Eurocharged tuner here in the UK says primary cat's give much better gains over removing secondary in comparison as they are pretty hefty, who else has just removed primary but left everything else completely stock? If it sounds like the above I am doing it!
I had straight pipes on my SL55 from the primary cats onwards, sounded fun for about 2 days then I hated it, was completely insane
I'm getting older and want to retain the nice sound AMG built, just with a bit more ommpphhhhh 
M
I've watched loads of videos of people who have removed secondary cats and or resonators. To me, personally, a lot sound really raspy and un-refined, more like a shouting car rather than a deep rumbling puuurrrrr.
I just watched this video, I think, going from description, guy has just removed his primary cats and left the rest, sounds really nice, same noise, just deeper, see here:
My Eurocharged tuner here in the UK says primary cat's give much better gains over removing secondary in comparison as they are pretty hefty, who else has just removed primary but left everything else completely stock? If it sounds like the above I am doing it!
I had straight pipes on my SL55 from the primary cats onwards, sounded fun for about 2 days then I hated it, was completely insane
I'm getting older and want to retain the nice sound AMG built, just with a bit more ommpphhhhh M
Senior Member
Joined: Feb 2011
Posts: 256
Likes: 15
From: NC
2010 C63 P31
I have been looking in to this also,
Seems that the only way to do it is Headers, Cats, then mid pipes to the resonators and leave everything else.
Unless you could find a shop to make a pipe from your manifolds to the secondary cats?
Seems that the only way to do it is Headers, Cats, then mid pipes to the resonators and leave everything else.
Unless you could find a shop to make a pipe from your manifolds to the secondary cats?
MBWorld Fanatic!
Joined: Jan 2010
Posts: 2,276
Likes: 409
C63 AMG
It may be an option, but the issue of having a raspy exhaust tone after the cat removals can be remedied by a quality cat back. I don't have the rasp with my Eisenmann cat back with the secondary and resonator removed. Its very controlled compared to the stock cat back.
Im curious to see if we can benefit from simply removing the primary cats. May be less labor intensive compared to a full LTH setup.
Im curious to see if we can benefit from simply removing the primary cats. May be less labor intensive compared to a full LTH setup.
Super Member
Joined: May 2014
Posts: 531
Likes: 143
From: England - UK
C63 AMG Saloon
Would love to know the same as I want that sound but not for £2500 fitted for headers haha
Did you get a price from MSL to do the work?
Think the below also has primary cats removed
Also just found this and he has more videos on his you tube, this is 2nd cat delete and the resonator delete behind the 2nd cats (I think that sounds pretty good)
Did you get a price from MSL to do the work?
Think the below also has primary cats removed
Also just found this and he has more videos on his you tube, this is 2nd cat delete and the resonator delete behind the 2nd cats (I think that sounds pretty good)
Last edited by Phil_T; Aug 19, 2014 at 02:33 PM.
Junior Member
Joined: Mar 2014
Posts: 20
Likes: 0
C63
I just removed my secondary cats... sounds great from outside the car. Still the original AMG sound, just a little bit louder and aggressive. Not raspy at all.
I was scared that it would be to loud, but after 2 days I'm already considering to delete the resonator also :-)
When driving with the windows closed in C-mode, normal driving, you can't tell the difference inside the car. Stealth-mode!
If you remove the primary cats, you will need a remap! I would leave them alone. Don't judge the sound on some crappy youtube videos...
I was scared that it would be to loud, but after 2 days I'm already considering to delete the resonator also :-)
When driving with the windows closed in C-mode, normal driving, you can't tell the difference inside the car. Stealth-mode!
If you remove the primary cats, you will need a remap! I would leave them alone. Don't judge the sound on some crappy youtube videos...
Thread Starter
Member
Joined: Nov 2011
Posts: 117
Likes: 0
From: London
C63 Estate
True re videos but it does give you some sort of idea.
I'm getting a remap after the work so no issue there.
That second video sounds raspy to me, first one sounds like everything has been removed lol!
I was thinking just unbolt from underneath the manifold & then cut the pipe after the primary cat's installing some straight pipe in place, I have a good fabricator. Or just gut the primary cats out, messy job but doable. Hmmmmm
Mapper said removal of primary will unleash some decent HP where as secondary / resonator is minimal. Not too fussed about gains, Eurocharged V5 map will make it pokey enough, just want that original C63 sound, just a bit louder.
Anyone actually done this mind before I butcher my exhaust
I'm getting a remap after the work so no issue there.
That second video sounds raspy to me, first one sounds like everything has been removed lol!
I was thinking just unbolt from underneath the manifold & then cut the pipe after the primary cat's installing some straight pipe in place, I have a good fabricator. Or just gut the primary cats out, messy job but doable. Hmmmmm
Mapper said removal of primary will unleash some decent HP where as secondary / resonator is minimal. Not too fussed about gains, Eurocharged V5 map will make it pokey enough, just want that original C63 sound, just a bit louder.
Anyone actually done this mind before I butcher my exhaust
Member
Joined: Jun 2014
Posts: 214
Likes: 14
C63 AMG
The guys at Eurocharged Canada recommend getting rid of the secondary cat and resonator whilst adding a custom H-pipe. They say it will keep that AMG sound but beef it up when in the higher revs.
Haven't done it yet though. If I go down that route, it would have to be next spring/summer.
Haven't done it yet though. If I go down that route, it would have to be next spring/summer.
Trending Topics
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
