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      04-09-2012, 09:51 PM   #8
desean81
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Drives: 2010 BMW 335i Coupé
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Location: Toronto, ON

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Quote:
Originally Posted by rader1 View Post
Cats require heat in order to function. They don't "filter" the fumes, they cause a chemical reaction that changes the fumes into CO2. Unless the cats are near the turbos then they won't have the heat necessary to function properly.

But yes, you can just weld some high flow cats in the midpipes to help with the smell.
Understood - hence the word catalytic

I would imagine the mid-pipes get hot eventually? That's why I'm wondering if a pre-heater of sorts would help get them working well quickly?

How do non-turbo cars have their cats setup? I'd think they'd end up further from the motor in an NA configuration?
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