Has anyone... [Deleted secondary cat stock] - BMW M5 Forum and M6 Forums

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Old 17th December 2007, 23:13   #1
M Venom
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Has anyone... [Deleted secondary cat stock]
I know that people have taken out the secondary cat when they put on their Eisenmann exhaust.

My question is, has anyone taken off the cat on stock exhaust? If so, how does it sound?


thnx!
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Old 18th December 2007, 00:57   #2
Rodster
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I have 2nd cat delete and replaced sect II or resonators with x-pipe along with Tubi mufflers. Here's a sound bite of mine if you haven't seen it already. Hope this is what you were looking for.

BTW: I absolutely love it. It sounds so much better in person. No trouble in the cabin.

http://www.youtube.com/watch?v=amTRbHkXcHc
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Old 18th December 2007, 01:05   #3
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Rodster,

Do you think there will be and smog check issues with secondary cats removed?
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Old 18th December 2007, 02:25   #4
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Quote:
Originally Posted by FogPuppy View Post
Rodster,

Do you think there will be and smog check issues with secondary cats removed?
I don't think anyone in Cali know that answer since nobody has done smog test yet.
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Old 18th December 2007, 02:48   #5
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No one has taken off 2nd cat on STOCK exhaust??
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Old 18th December 2007, 02:58   #6
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Quote:
Originally Posted by M Venom View Post
No one has taken off 2nd cat on STOCK exhaust??
Sorry for misleading you, but no one ever take a car for smog check with cats deleted yet.
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Old 18th December 2007, 03:22   #7
Rodster
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Keang24 is right. When I bought from eisenmann they said it should pass because of the primary still in place. Then, I take it to my muffler guy and he says it mostlikely will not pass smog here in Cali. I kept sect. 1 just for that reason. When the time comes I will try for a pass unless someone in cali says they failed with secondary cats deleted.

The sound is awesome and well worth it. It also seems like it has added strength the car.
Last edited by Rodster; 18th December 2007 at 03:41.
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Old 18th December 2007, 05:26   #8
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It shouldn't be a problem seeing how they will just plug in the OBDII reader and see if there are any errors. If you don't have a service engine soon light there shouldn't be a problem.
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Old 18th December 2007, 05:28   #9
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Sorry for the miscommunication, but i was asking the cat question for sound purposes not smog...
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Old 18th December 2007, 06:10   #10
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Quote:
Originally Posted by M Venom View Post
Sorry for the miscommunication, but i was asking the cat question for sound purposes not smog...
sorry again, got mess-up with FogPuppy comment.

Yes. the 2nd cat deleted will give a little raspy groaning from the midsection. I have 2nd cat/resonator deleted with stock muffler for about a week while waiting for a new exhaust, so I definitely noticeable with 2nd deleted. Not much louder, just more raspy
Last edited by keang24; 18th December 2007 at 06:11.
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