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      09-28-2019, 03:57 AM   #1
hokiedood
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What is the definition of "cell" in relation to downpipes?

Can anyone explain?
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      09-28-2019, 04:28 AM   #2
Delta0311
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In scientific terms...


The cell count of a catalytic substrate refers to the number of holes per square inch and is a direct indication of the flow capabilities of that substrate. The lower the count of holes the bigger the hole need to be to fill one square inch, a bigger hole subsequently flows more exhaust gasses.
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      09-28-2019, 07:09 AM   #3
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Might also refer to CEL or check engine light. A normal occurrence when swapping in catless downpipes. Performance chips typically clear that problem.
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      09-28-2019, 07:22 AM   #4
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I believe what’s going on is the higher cell count means more holes yes, but also more material to react with exhaust gasses to reduce emissions.
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      09-28-2019, 08:37 AM   #5
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CELLS - Literally the little connected boxes inside the converter.
CEL - Check Engine Light

The factory converter has 750 cells, and is therefore more restrictive than the after-market converters, which usually have 200 cells.

A 300 cell converter will not usually cause a check engine light, but all but 1 (Fabspeed) 200 cell converters will cause a check engine light.
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