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Old 25-03-2012, 10:32 PM   #1
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W210 cat replacement or removal

Hi

I have the dreaded rattle on one of my rear cats on me E430 estate. I'm looking at various options. One of which is just removing the rear cats as there are no sensors that far down the exhaust. Will this work, or would I have emissions problems at MOT time?


Any advice would be appreciated on the best thing to do, and if that is replacement, what ones to get.


Thanks


R
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Old 25-03-2012, 10:38 PM   #2
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why dont u have it replaced instead ?
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Old 25-03-2012, 10:44 PM   #3
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Hi,
Is the rattling that noticable? One of the lower cats rattled on my 43 but before I could do anything about it the rattling stopped, the broken bits of the core of the cat probably got blown out of the exhaust system or jammed in the middle box. Unless the rattle is really loud or annoying leave it alone. You could remove the lower cats and the car should still pass the emissions. I have since removed my lower cats and middle resonator box and it passes the emissions ok.
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Old 26-03-2012, 11:53 AM   #4
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If fitted originally, haven`t cats to be present (well at least visible) for the new MOT regs.?
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Old 26-03-2012, 12:26 PM   #5
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Quote:
Originally Posted by Dichtung View Post
If fitted originally, haven`t cats to be present (well at least visible) for the new MOT regs.?
The O/P still has his CATs there, hence my comments to leave them alone unless the noise was to obtrusive.
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Old 26-03-2012, 12:58 PM   #6
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Quote:
Originally Posted by andy27168 View Post
The O/P still has his CATs there, hence my comments to leave them alone unless the noise was to obtrusive.
Agreed 100%, and hope that the innards blow out or jam as yours.

But the OP is thinking that removing the cat/s completely is an option?
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Old 26-03-2012, 09:43 PM   #7
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Cut open, remove "brick" weld back up, and it will fly through emissions.
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Old 27-03-2012, 07:40 AM   #8
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Thanks for the replies guys. I'll leave it a while and see if the noise stops. Fingers crossed.

Regarding the removal, my car has four cats, so if I remove the rear two, the front two will still be there. I like the idea of removing the bricks and welding up again. Hadnt thought of that!
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