secondary cats or resonator
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Member
Joined: Jan 2014
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From: the netherlands
C 63 AMG PP
secondary cats or resonator
Maybe this question has been made over and over again but I want to remove the resonator or secondary cats.
What is better for sound and/or performance?
If I remove the resonator, should I install an x-pipe or straight pipes?
It is so difficult to hear the differences on YouTube
Thanks!
What is better for sound and/or performance?
If I remove the resonator, should I install an x-pipe or straight pipes?
It is so difficult to hear the differences on YouTube
Thanks!
Super Member
Joined: May 2011
Posts: 918
Likes: 21
From: NYC
2017 C63S coupe '09 C63, '15 Durango RT, '14 Jeep SRT8
Maybe this question has been made over and over again but I want to remove the resonator or secondary cats. What is better for sound and/or performance? If I remove the resonator, should I install an x-pipe or straight pipes? It is so difficult to hear the differences on YouTube Thanks!
Super Member
Joined: May 2011
Posts: 918
Likes: 21
From: NYC
2017 C63S coupe '09 C63, '15 Durango RT, '14 Jeep SRT8
I removed the secondary cats and there is no drone. Took the resonator off and there was drone around 60-90mph. Put the resonator back on and drone is gone. I had a straight pipe for secondary cats and x-pipe for resonator.
Super Member
Joined: May 2011
Posts: 918
Likes: 21
From: NYC
2017 C63S coupe '09 C63, '15 Durango RT, '14 Jeep SRT8
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From: Jersey
C63 Coupe
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Joined: Jan 2014
Posts: 108
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From: Toronto York-R, Canada
E92 335i / C63 AMG / GSX-R 600
I just had my secondary cats replaced by straight pipes. Exhaust note is the same, but you hear it more when you step on it. The whole car feels better too. You can tell there is more air flow now. The engine revs better/faster and seems happier. Shifts sound much better too. I suggest you do this, and see how you like it. If you still want more you can replace the resonator with an xpipe to get more noise.
Senior Member
Joined: Sep 2007
Posts: 435
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ml55, Ml63, Porsche, C63S ED1
for those who want to see what's in the secondary cats, I hope this doesn't encourage you to add more smog to the air, but just so you know what is going on:
I have the two secondary cats which are attached together, compared to the Magnaflow Ultra High Flow cats I installed to get better flow, better sound and still help clean the air that comes out.
If I was to estimate the additional flow based on how much sound increased I'd say it gets 2x more flow than the stock ones. You can also see how much more restriction stock secondary cats have vs primary.
Soon I will change the larger Primary Cats with HJS cats to finish it off and headers. I worked my way from back to forward on this one since they were easier first, and do the hard ones later, while I still can enjoy the car on each minor improvement and feel the incremental gains of both sound and performance so it doesn't get so boring.
I have the two secondary cats which are attached together, compared to the Magnaflow Ultra High Flow cats I installed to get better flow, better sound and still help clean the air that comes out.
If I was to estimate the additional flow based on how much sound increased I'd say it gets 2x more flow than the stock ones. You can also see how much more restriction stock secondary cats have vs primary.
Soon I will change the larger Primary Cats with HJS cats to finish it off and headers. I worked my way from back to forward on this one since they were easier first, and do the hard ones later, while I still can enjoy the car on each minor improvement and feel the incremental gains of both sound and performance so it doesn't get so boring.
Last edited by ruey220; Apr 30, 2014 at 05:35 PM. Reason: pics didn't upload
MBWorld Fanatic!
Joined: Aug 2011
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From: Kitchener, ON
2010 C63 AMG
I have straight pipes for secondary cats and I'm considering straights for the resonators.
Super Member
Joined: Apr 2009
Posts: 752
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From: Orange County CA
CLS63S
For those of you removing your resonator now, and then getting long tube headers, hang onto your resonator.
I had no resonator with long tube headers and it sounded awful... it lost the AMG sound.
I had no resonator with long tube headers and it sounded awful... it lost the AMG sound.
Senior Member
Joined: Sep 2007
Posts: 435
Likes: 6
ml55, Ml63, Porsche, C63S ED1
it does lose the AMG sound but the trade off is it get a bit louder. I was thinking at first I've lost the growl of the engine above 3500rpm but the tradeoff is now it sounds like a race car screaming like mad.
