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Upgrading Exhaust with 200 Cell Cats.

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Will installing 200 cell cats on 997.1 cause a CEL? If so, is there anything that can be done to eliminate it?  Also curious whether their use on car with PSE will significantly increase exhaust loudness as I'm not really looking for more sound. Appreciate any feedback including performance experience when combined with competition throttle body and intake plenum.

Thank you.

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I have been running 200 cell cats on my 996.2 for about 3 years.  No CELs and the car runs great.  The ones I purchases were x-pipe cats where the exhaust from both cylinder banks are combined.  The exhaust is slightly louder but I don't think the change was that significant.


My car does run a little rough (ie almost to the point of stumbling) for the first 30 seconds or so when completely cold that may be related to the exhaust changes but I'm not sure and it is only a very minor annoyance.

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Thank you kgoetz.


There appears to be a wide range in prices for 200 cats. Does anyone have any experience on whether there is a corresponding range in quality? TopGear from UK or Circuit Werks are1/3 the price of FabSpeed or CarGraphic for example. Is the price delta in the catalyst or stainless steel/workmanship. Appreciate the feedback.

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Excellent suggestion. Had never hear of them.  Glad to know they pass CA smog.  New CARB procedures however consist primarily of an inspection rather than tailpipe test. Using "original" equipment is best then.

Thank you.  

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Yes, the new inspection consists of reading the obdii readiness flags (misfires, evap, cats, O2 sensors, etc) and also a visual inspection.



Excellent suggestion. Had never hear of them.  Glad to know they pass CA smog.  New CARB procedures however consist primarily of an inspection rather than tailpipe test. Using "original" equipment is best then.

Thank you.

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