C63 AMG (W204) 2008 - 2015
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secondary cat delete?

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Old May 11, 2014 | 04:21 AM
  #1  
mikeyyyallday's Avatar
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2011 MB C63 AMG. 2014 MUSTANG COVERTIBLE V6. 2010 MUSTANG CONVERTIBLE V6.
secondary cat delete?

can someone explain to me what this means….and does it need to be replaced with something or not? can any local exhaust shop do this job?
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Old May 11, 2014 | 10:56 AM
  #2  
AMG893's Avatar
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Yeah, any exhaust shop can do this.

It will be removed, and replaced with a normal pipe.
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Old May 11, 2014 | 12:03 PM
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https://mbworld.org/forums/c63-amg-w...uy-thread.html

Secondary cat delete removes the cats halfway between the engine and exhaust tips. It needs to be replaced with either a straight pipe or h-pipe or something. Take a look at the thread for more info and also a fantastic option in purchasing the replacement pipe. Mike makes quality parts.
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Old May 11, 2014 | 12:31 PM
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Originally Posted by mikeyyyallday
can someone explain to me what this means….and does it need to be replaced with something or not? can any local exhaust shop do this job?
i posted about this in the following thread.
https://mbworld.org/forums/6026665-post13.html
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Old May 11, 2014 | 02:43 PM
  #5  
mikeyyyallday's Avatar
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anywhere else that sells quality pipes? mike might be out.
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Old May 11, 2014 | 03:02 PM
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save your money and just go to a muffler shop for $200 lol
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Old May 11, 2014 | 05:32 PM
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Will removing the secondary cats and straight pipe cause a CEL? Will it pass state inspections?
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Old May 11, 2014 | 05:40 PM
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Originally Posted by estrellajon
Will removing the secondary cats and straight pipe cause a CEL? Will it pass state inspections?
It probably will
Iirc the ecu compares O2 sensors and since it won't see a difference since the cat is gone

If your state does a visual emission inspection you may get caught
You may also fail the sniffer
They are there for a reason

imo the car will run better and more efficiently with them
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Old May 11, 2014 | 06:44 PM
  #9  
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Originally Posted by Ingenieur
It probably will Iirc the ecu compares O2 sensors and since it won't see a difference since the cat is gone If your state does a visual emission inspection you may get caught You may also fail the sniffer They are there for a reason imo the car will run better and more efficiently with them
My state does OBD. If it shows CEL or not ready then won't pass.
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Old May 11, 2014 | 06:54 PM
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you wont get a CEL with secondary cat delete. i wouldnt worry about emissions because its obd2 testing and because secondary cat delete is not loud enough to raise any eyebrows. a visual is another story but do they really look on an otherwise stock looking car?
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Old May 11, 2014 | 07:18 PM
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Why no CEL?
If both sensors see the same O2 won't that indicate the cat is not functioning?

Don't folks have it programmed out?

But it still is trying to trim the mixturep
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Old May 11, 2014 | 07:21 PM
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Originally Posted by Ingenieur
Why no CEL?
If both sensors see the same O2 won't that indicate the cat is not functioning?

Don't folks have it programmed out?

But it still is trying to trim the mixturep
No cel because the secondaries are after the post cat oxygen sensors
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Old May 11, 2014 | 07:31 PM
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Originally Posted by dubzAMG
No cel because the secondaries are after the post cat oxygen sensors
Don't our cars have 4 sensors
A set after the primary and a set after the secondaries?
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Old May 11, 2014 | 07:33 PM
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Originally Posted by Ingenieur
Don't our cars have 4 sensors
A set after the primary and a set after the secondaries?
Yes they do have 4, the post cat sensors go after the primaries.
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Old May 11, 2014 | 07:39 PM
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Originally Posted by dubzAMG
Yes they do have 4, the post cat sensors go after the primaries.
Thanks
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Old May 11, 2014 | 09:31 PM
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Deleted mine with straight pipes in place for only $70 at a local exhaust shop
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Old May 11, 2014 | 09:37 PM
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does it make a significant sound difference compared to stock?
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Old May 11, 2014 | 09:52 PM
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Originally Posted by mikeyyyallday
does it make a significant sound difference compared to stock?
yes, but only if you get on the throttle. otherwise its as quiet as stock when cruising around. hands down the best bang for buck mod you can do.
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Old May 11, 2014 | 10:33 PM
  #19  
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Originally Posted by intence
you wont get a CEL with secondary cat delete. i wouldnt worry about emissions because its obd2 testing and because secondary cat delete is not loud enough to raise any eyebrows. a visual is another story but do they really look on an otherwise stock looking car?
No visual at all. They only care about is OBD systems passing. They used to do sniff and visual years back but not anymore.

If there are no sensors after the primaries then possibly no CEL. Are there some gains or just for pissing off neighbors?
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Old May 12, 2014 | 12:26 AM
  #20  
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Originally Posted by ImportToAMG
Deleted mine with straight pipes in place for only $70 at a local exhaust shop
Which shop did you go to? I want to get it done too. Did you replace the resonator and secondary cats or just one of them? PM if you don't want to reply here.

Did you own an ISx50? Your username sounds very familiar.
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Old May 12, 2014 | 01:42 PM
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S550 on order

this is with just 2nd cat delete revving to like 2500-3000 rpm .. it's mikes straight pipes ..no CEL but it's loud as hell when you get into it
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Old May 12, 2014 | 03:32 PM
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H Pipe the cats + Straight piped resonators and the car sounds like a beast no CEL's.






As others have mentioned, its a nice mod for a relatively low price.

Don't waste time with power pipes, go to a reputable muffler shop and have them do it for you for less then half the price!
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Old May 12, 2014 | 05:16 PM
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Hello gents I currently have 2 units

Yes you can go to a shop and get a $70.00 job on your 60K car
You will get regular aluminized pipe ( not OEM quality ) and it will have regular bends as well ( kinks ).

I make stainless steel same grade as OEM with stainless Vands so you bolt on and off for such issues as inspection / off road use.

Hope this help

End of the day if you don't care what goes on your car then it's your call.
You get what you pay for.
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Old May 12, 2014 | 06:03 PM
  #24  
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will replacing second cats with straight pipes require a retune? my car is velos tuned.
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Old May 12, 2014 | 06:09 PM
  #25  
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Originally Posted by mikeyyyallday
will replacing second cats with straight pipes require a retune? my car is velos tuned.
no
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