Can someone shed some light- e46 Exhaust

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  1. Can someone shed some light- e46 Exhaust 
    #1
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    e46xi's Car Details
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    Hi guys! So i am not too familiar with exhaust systems but i've been really looking into them.
    I love this one for it's sound and price and i'm just a bit confused....link to one i want to buy here: MAGNEX CAT BACK EXHAUST SYSTEM BMW E46 325 / 328 / 330 | eBay

    Now on a normal stock oem e46 exhaust system i'm confused because i don't know what this third thing is (look at image)
    is that the cat? would i have to remove my catalytic converter to put this on? i know what a cat does but i have no idea what it looks like on my exhaust and im assuming its this third box
    i know the first is the muffler, second is resonator, but what is the third thing?
    thanks for your help guys its very appreciated!

    Attachment 37041
    Sorry the image came oout so small...if anyone knows hwo i can upload a bigger one let me know
     
     

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    TheEnd's Car Details
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    3 is the cat, 1/2 are just silencers, and the join is just behind the cat.


    3 is the secondary cat in fact, the primary cats are just visible at the top of the screen.
     
     

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    e46xi (24-03-2012)

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    #3
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    Would you know if it is illegal to remove the secondary cat?
    Or if i would get a Check Engine light by removing it...and if i DID get a CEL how i could get it to go away?
     
     

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    It depends on where the secondary lambda sensors are.
    If they are behind the first cats, you could probably get away with it, but if they are behind the middle section, it will be noticed and it'll bring on your CEL.

    They can be tuned out in some cases, or sometimes a little bolt in lambda bung can help avoid it as it keeps the sensor tip out of the main flow.
     
     

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    e46xi (24-03-2012)

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    I'll do abit of research, thanks a bunch bud! you've been a great help!
     
     

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    TheEnd (24-03-2012)

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