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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > MHD Burples in a catless downpipe



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      02-18-2020, 12:42 PM   #1
shinobi_1
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MHD Burples in a catless downpipe

Hi

I wanted to know if anyone is running a fully catless system which include the downpipes and exhaust and are you getting burples from the MHD flash because Im not. I played with all the burples setting from medium to all the way up and still no burples. I'm thinking since there isn't a catalytic converter to burn the excess fuel, that's why Im not getting any burples. Can anyone else verify this or know to help me with the burples.
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      02-18-2020, 12:44 PM   #2
msjt
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BURPLES!!!!
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      02-18-2020, 12:55 PM   #3
TheMidnightNarwhal
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I am fully catless with stock IS muffler and I get them, so loud police gets called for gunshots. I like it.

Why would you think having no cats would make it NOT burple? It's the opposite. More and louder if nothing blocking the way.
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      02-18-2020, 01:53 PM   #4
shinobi_1
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Quote:
Originally Posted by TheMidnightNarwhal View Post
I am fully catless with stock IS muffler and I get them, so loud police gets called for gunshots. I like it.

Why would you think having no cats would make it NOT burple? It's the opposite. More and louder if nothing blocking the way.
If you still have your stock exhaust then you have a second bank of catalytic converters to burn the excess fuel to create the burple. I have an aftermarket cat back exhaust which is also catless so that's what i meant by fully catless but I think i answered my own question. That's why I'm trying to find someone else with the same setup as mine and are getting burples.
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      02-18-2020, 01:56 PM   #5
TheMidnightNarwhal
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Quote:
Originally Posted by shinobi_1 View Post
If you still have your stock exhaust then you have a second bank of catalytic converters to burn the excess fuel to create the burple. I have an aftermarket cat back exhaust which is also catless so that's what i meant by fully catless but I think i answered my own question. That's why I'm trying to find someone else with the same setup as mine and are getting burples.
My exhaust is modified but the muffler is all stock.
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      02-18-2020, 02:28 PM   #6
JM98
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Do you have them on in sport only mode?
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