catalytic converter question

Striker187

Member
:
2008 MS3 GT
i'm thinking about adding a hi-flow cat in whenever i get my dp as my county is gonna start having emissions testing started next year. i was gonna go with a carsound cat and they come with or without some air tube attachment. our cars don't have this air tube right? what's it for anyways?
 
Striker187 - there is no air injection on the factory stuff. Generally those were only required for the old school domestics, as w/o pumping air into the cat, they wouldn't pass on the sniffers.
 
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