MHD burbles on sports cat bad?

F36 435i M · 10-14-2021, 07:16 AM

Hi guys,

I apologise if this has been asked before but haven’t seen many decent recent posts asking this. I am currently running MHD burbles on medium at 1.0 seconds, today I’ve just changed it to soft. I did use the aggressive setting for the first 2 days to see how it would sound and it was CRAZY! Even in medium the bangs were quite loud in sports plus manual mode. Now that it’s in the soft mode it has been toned down quite a bit.

Does anyone run medium burbles at 1.0 sec on a sports cat or stock cat? Just wanted to know if it still damages the cat quite badly? And am I best just to keep it on soft or even OEM? I don’t wish to go catless due to legal reasons.

Thanks in advance

BMWILUVU · 10-15-2021, 08:43 AM

I think you can intuitively tell that igniting fuel downstream of the combustion chamber is not good for the equipment experiencing that. That would include the turbo, headers, catalyst, O2 sensors would likely accelerate wear and tear not to mention waste alil gas and amplifying the ricing factor. I turned my burbles off but if you stick with similar level of the overruns the stock tune provides and not run aggressive it may be ok.

10-14-2021, 07:16 AM	#1
F36 435i M Private 8 Rep 73 Posts Drives: BMW 435i GC Join Date: Jul 2021 Location: Uk iTrader: (0)	MHD burbles on sports cat bad? Hi guys, I apologise if this has been asked before but haven’t seen many decent recent posts asking this. I am currently running MHD burbles on medium at 1.0 seconds, today I’ve just changed it to soft. I did use the aggressive setting for the first 2 days to see how it would sound and it was CRAZY! Even in medium the bangs were quite loud in sports plus manual mode. Now that it’s in the soft mode it has been toned down quite a bit. Does anyone run medium burbles at 1.0 sec on a sports cat or stock cat? Just wanted to know if it still damages the cat quite badly? And am I best just to keep it on soft or even OEM? I don’t wish to go catless due to legal reasons. Thanks in advance
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10-15-2021, 08:43 AM	#2
BMWILUVU Lieutenant Colonel 809 Rep 1,597 Posts Drives: 340ix Join Date: Mar 2017 Location: The Boibs iTrader: (0)	I think you can intuitively tell that igniting fuel downstream of the combustion chamber is not good for the equipment experiencing that. That would include the turbo, headers, catalyst, O2 sensors would likely accelerate wear and tear not to mention waste alil gas and amplifying the ricing factor. I turned my burbles off but if you stick with similar level of the overruns the stock tune provides and not run aggressive it may be ok.
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