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Secondary Cat delete on C63s Perf Exhaust

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Old 04-12-2017, 02:38 PM
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Originally Posted by Vic55
Both my C63S and GTS are stock with the performance exhaust--- the level of sound is very close with the GTS slightly louder due to shorter distance piping. I would guess with the second cat pull on a C63S would push that car much closer to the OEM sound of the GTS with the exhaust flaps wide open.
Thanks! As I understand it, the GTS bypasses the rear muffler entirely in loud mode. My non-S will probably need a rear muffler delete AND a cat delete to sound like the GTS!
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Old 04-12-2017, 03:07 PM
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Originally Posted by Andyroo
Thanks! As I understand it, the GTS bypasses the rear muffler entirely in loud mode. My non-S will probably need a rear muffler delete AND a cat delete to sound like the GTS!

Yes, its basically a straight piped system with 2 cats.
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Old 04-12-2017, 06:03 PM
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Originally Posted by Vic55
Yes, its basically a straight piped system with 2 cats.
Do you find the GTS loud enough?
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Old 04-12-2017, 06:18 PM
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Originally Posted by Andyroo
Do you find the GTS loud enough?
Its subjective but Im ok with it... maybe could be 20% louder but Im probably more along the "wanting noise" side of the spectrum.
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Old 04-12-2017, 06:21 PM
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For those of you that have done this, can you hear the turbos while revving/driving casually like you normaly would with a cat-less downpipe? Or does the primary cat hold that noise back?
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Old 04-12-2017, 10:19 PM
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Originally Posted by Andyroo
do you know how it compares to an AMG GT in loud mode?

I haven't driven a GT yet, so can't compare. But looking forward to it at Lime Rock this summer.
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Old 04-12-2017, 10:26 PM
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Originally Posted by C63SEd1
There's growing body of forum members who had this relatively inexpensive mod done. Myself, Sanch, Alex98, Ugotmopped, AMG 17GT, kuba.95. Not sure if I'm missing others. We all have only glowing positive reviews. Take the leap of faith and you will love it.
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Old 04-12-2017, 10:30 PM
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Originally Posted by Wwevo9
For those of you that have done this, can you hear the turbos while revving/driving casually like you normaly would with a cat-less downpipe? Or does the primary cat hold that noise back?
I don't.
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Old 04-13-2017, 08:08 AM
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I did it the first week of owning my sedan; I haven't done it on the cabrio.
I could do a video of both if guys want in order to hear the difference


let me know
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Old 04-13-2017, 08:23 AM
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Would love a video of both... Which do you prefer? Sound wise?
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Old 04-13-2017, 08:35 AM
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To be honest from the driver seat the sound is not that different. Maybe because the cabriolet is open and has no actual roof. But the sedan sounds a little louder once on boost
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Old 04-13-2017, 10:52 AM
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Originally Posted by Vic55
Both my C63S and GTS are stock with the performance exhaust--- the level of sound is very close with the GTS slightly louder due to shorter distance piping. I would guess with the second cat pull on a C63S would push that car much closer to the OEM sound of the GTS with the exhaust flaps wide open.


Edit, my GTS is tuned and Weistec was able to tweak the software for more overrun and battleship pops but stock its still louder.
You have to remember, removing the secondary CAT will not only increase volume but will change the sound compared to stock. Some people will not like the increased higher frequencies. Personally, I love how it sounds with the secondary cat delete.
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Old 04-13-2017, 10:59 AM
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I live in Dallas and will be doing this mod today after work. I plan on going to a shop in Denton, which has worked on a lot of muscle cars as well as cars like ours. My buddies have nothing but positive reviews about this place, so I am optimistic that everything will go well as the job should be pretty easy. I will try to post a before and after video once I get the cats cut.
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Old 04-13-2017, 11:16 AM
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Originally Posted by Alex98
Just did it yesterday and sounds mean! Worth it if you're not wanting to drop 3k+ on a tune catless downpipe
Hey mate did hows the secondary cat delete so far? You dont need tune right? No lights on just confirming. Also, you have the perf exhaust too..
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Old 04-13-2017, 12:10 PM
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Originally Posted by shoe3k
You have to remember, removing the secondary CAT will not only increase volume but will change the sound compared to stock. Some people will not like the increased higher frequencies. Personally, I love how it sounds with the secondary cat delete.
You have done this? Any clips? My post above was more along the lines of sound increase (decibels) vs pitch and tone changes. From the posters here who have done it; they state its more of the same.
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Old 04-13-2017, 12:57 PM
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Originally Posted by Vic55
You have done this? Any clips? My post above was more along the lines of sound increase (decibels) vs pitch and tone changes. From the posters here who have done it; they state its more of the same.
Definitely more of same on GT Vic, but an octave lower here.

Also when valve closed there is a funkier idle that I dig.
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Old 04-13-2017, 03:57 PM
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To those who have already done this mod, did everyone just cut out the secondary cat and weld a straight pipe in it's place? Or did anyone have the shop create a flange so you can swap the stock secondary cat back in place if need be?
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Old 04-13-2017, 09:24 PM
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Originally Posted by Vic55
You have done this? Any clips? My post above was more along the lines of sound increase (decibels) vs pitch and tone changes. From the posters here who have done it; they state its more of the same.
No. I heard one at the dealer and noticed that it was louder but had a sharper sound through the rpm range. He had performance exhaust and the secondary cat delete done from what he told me.

I did find a video here that sounded similar.
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Old 04-15-2017, 03:11 AM
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Originally Posted by shoe3k
No. I heard one at the dealer and noticed that it was louder but had a sharper sound through the rpm range. He had performance exhaust and the secondary cat delete done from what he told me.

I did find a video here that sounded similar.
https://www.youtube.com/watch?v=UjyE2wD5TQM
That's my car haha, and I posted that video along with 2 others earlier in this threat I think.
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Old 04-28-2017, 05:27 PM
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Hey guys,

I had my car up, and was looking for the secondary cats on my 2017 C63s coupe with the performance exhaust. Is it at bottom of the down pipes ?
Thanks for any input....

Marco
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Old 04-28-2017, 07:46 PM
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c63s sedan
Originally Posted by 1 SIC DR
Hey guys,

I had my car up, and was looking for the secondary cats on my 2017 C63s coupe with the performance exhaust. Is it at bottom of the down pipes ?
Thanks for any input....

Marco
look at previous posts in this thread. itll show a diagram. but yes at bottom of downpipes.
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Old 05-07-2017, 08:05 PM
  #172  
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Not the best video but it shows how loud the pop/bangs are

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Old 05-07-2017, 08:58 PM
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Does the resonator or secondary cat delete cause any drone wit cruising? I did a resonator delete back on on my 5 series BMW and it would drone when cruising at 75 mph on the highway.
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Old 05-07-2017, 09:37 PM
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Originally Posted by digitalnav
Does the resonator or secondary cat delete cause any drone wit cruising? I did a resonator delete back on on my 5 series BMW and it would drone when cruising at 75 mph on the highway.

I've had it done for about 2 months and no drone at all
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Old 05-07-2017, 09:53 PM
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Where exactly is it located on the car? is it easy to re-install if needed?
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