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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 05-09-2013, 03:42 PM   #1
Teerump
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Exhaust, cats question

Hey guys,
Just picked up my M3, 2003 Alpine White. It has Fabspeed headers with stock exhaust. While driving getting really rich exhaust smell in the cabin.
I've purchased a Corsa car back to put on.

Owner said its running catless, that's because of the headers correct?
What can I do to help with the rich exhaust?

Thanks for the info.
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Old 05-13-2013, 01:16 AM   #2
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catless smells different to usual. much more of an acrid exhaust smell.

maybe the car isn't tuned 100% for new headers + catless?
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Old 05-13-2013, 05:40 AM   #3
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I don't know when the car was tuned, before or after the headers were put on. I'll try and find out.

UPDATE: The car now has the Corsa on it, So it has Fabspeed headers, section 1 with no resonator, and the Corsa. The exhaust is sooo rich smelling, almost don't want to drive the car because the smell is so strong.
What do I need to do to fix this?

Last edited by Teerump; 05-13-2013 at 06:17 AM.
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Old 05-13-2013, 09:11 AM   #4
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the smell emit when going WOT? or do you smell it when coming to a stop?
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Old 05-13-2013, 09:17 AM   #5
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It smells all the time... when driving down the highway you can smell it in inside the car, and when stopped, standing at the back of the car it is really bad coming out of the exhaust.
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Old 05-13-2013, 10:13 AM   #6
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Smelling exhaust in the cabin of the car is a bad sign. Fumes are escaping, probably at one of the connections between the headers and the back cats (the M3 has 2 cats mounted in the stock exhaust manifold and 2 more directly downstream). Your aftermarket headers have eliminated the front pair. If the second pair is missing as well, additional modifications have been made.
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Old 05-13-2013, 10:53 AM   #7
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Subscribed. Mine actually is running really rich after engine work, headers, etc.. smell is "bad" outside the car but I'm not super concerned as that's normal.. what isn't normal is the smell coming into the cabin even while the windows are up on the highway. I'm taking mine back to the shop to have them look at it and will post results OP
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Old 05-13-2013, 01:04 PM   #8
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My set up is Fabspeed headers, no cats.... OEM section 1 no resonator and the rest is the Corsa system.
Could I just go with some magnaflow cats I saw on Amazon for $70 and have them welded into section 1? Would that take care of it, and have all other connections checked?
Or would I be better to go with the Euro Custom Performance section 1?
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Old 05-13-2013, 01:08 PM   #9
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Cats will definitely help.. but I wouldn't just put any old cat on there. I would go with 300cel race cats. Your headers will burn out the factory cats pretty damn quick.
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Old 05-13-2013, 03:57 PM   #10
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I can supply you with euro cats...pm sent

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Old 05-13-2013, 09:41 PM   #11
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Old 05-26-2013, 09:59 PM   #12
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I have the same set up. Minus the corsa. Someone mentioned getting it tuned. Which tune do you use and where who does it? Sorry for hijacking the thread. I don't have fumes coming into the cabin.
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Old 05-26-2013, 11:35 PM   #13
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It was tuned by Active Autowerke.
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Old 05-27-2013, 12:36 AM   #14
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The previous owner had one of the cats in my car cut out and it's running perfectly *shrug*
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