what is the pros of cutting out the cat in my car


Asked by Apr 05, 2014 at 03:39 AM about the 2002 Audi A4 1.8T Sedan FWD

Question type: Car Customization

what are the pro*s in cutting out the cat in my car

4 Answers


I can't think of any. A good catalytic convertor is better than none. Cleans the air, supplies the necessary back pressure to the engine, etc.


You may gain a couple more horsepower, but if you live in a state that makes you pass a smog test, you will fail. Then you will have to spend big bucks to by another. Unless you keep it and just weld in a straight pipe. Not sure but if you have an O2 sensor on the downstream side of the cat, that may cause your check engine light to come on which is a no pass for a smog test also.


Not a good idea unless you are racing only. There are perf cats available too with larger dia inlet & outlets for bigger exhaust tubes. And I think this removal messes-up the O2 sensor. JIMZ


more cons then pros in my opinion.unless you want to put the stock exhaust each time you need to pass smog.

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