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Discussion Starter #1
i got a 05 chevy lly duramax and i replaced the muffler with a piece of flex pipe. Suprisingly, its still quiet but you can hear the turbo a little more. my buddy has a 02 duramax that he put a new exhaust on. i was thinking about using his downpipe because his had no cat and mine does. will removing the cat throw any codes?
 

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it may on an LLY, the cat is what robs the sound not the muffler figure that one out!
 

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Discussion Starter #3
ya i couldnt believe it. but id like to put that catless downpipe in but i want to make sure no engine code will pop up
 

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you won't throw any codes by removing the cat on an LLY truck
 

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Discussion Starter #6
ok thanks for your help! :)
 

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i pulled mine out right away and I never got a CEL.
 

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you won't throw any codes by removing the cat on an LLY truck

X2


There are no sensors downstream of the converter to throw any codes (unlike a gasser).
 
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