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- - Cats (https://www.truckforums.com/forum/chevy-silverado-gmc-sierra-forum-11/cats-11828/)

huntin03z71

10-20-2009 02:43 PM

Cats

i wanna put two high flow cats on my truck but idk the size of pipes on the truck....what size inlet cats should i buy? thanks

timber74wolf

10-20-2009 03:48 PM

Why do you want to instal cats when you do not have any on it as it sits now? Fail an inspection? Trying to gain some backpressure back? Or are you do you have a check engine light on?

RUFFNECK4LYFE

10-20-2009 06:51 PM

Try 3"

chevy112488

10-20-2009 11:46 PM

2.25" is stock size a believe.

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