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Old 08-08-2010, 06:39 PM   #21
tora
Scooby Guru
 
Member#: 5851
Join Date: Apr 2001
Chapter/Region: VIC
Location: Vancouver
Vehicle:
09 Forester XT
+ NA Miata

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2010, the way you are describing it, the Catalytic converter is acting as an independant heat source. The catalytic converter is heated VIA the exhaust gases and only functions when heated to a certain temp. This is why your car spews out most of it's harmful emissions within the first 5-10 minutes of driving...once the catalytic converter is heated the emissions drop drastically. If you would like to DISPROVE your theories simply put a catless downpipe on a car, and go through aircare, then put a catted downpipe (or stock) with everything else identical and see what happens.
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