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Discussion Starter #1
Wondering if we take the catalytic converter off my 03 5.9, would it cause any problems or error codes to appear?
 

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I Run the MBRP Pipe as well. No Codes. Couldnt tell much of a difference performance wise but it sure sounds meaner.
 

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I just lost my kitty this weekend and all is well so far!
 

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i have a FBD 5" straight no cat and no problems.
i had mine straight with a cat for a while and its 3x louder without the cat
sounds great to me but i bet the neighbors hate it. oh well...
i thought the 03's didnt have cats though? maybe some do and some dont.
 

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Discussion Starter #8
Hey y'all, thanks so much for the great information. I guess we'll take it off then!! Can't wait to hear the improvement!
 

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hydraulic lifter crew
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oh, your gonna hear the improvement all right. LOL
i straight piped mine last week and left the cat on, and its loud as hell.
cant imagine how loud its gonna be without the kitty.
 

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Mine is straight and everyone says I sound like a tracter, and that its too loud. ha what do they know they all drive gasers..:lol3:
 

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Discussion Starter #13
thats affirmative.

although, im not sure i would like it THAT loud, without a cat. still smiling when i get on it with the pipe though !
I haven't stopped smiling since I bought the 03. Smiles are gettin better though.

Elephant, how do you like the Edge EZ? Just installed mine yesterday. Do you get better MPG?
 

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hydraulic lifter crew
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I haven't stopped smiling since I bought the 03. Smiles are gettin better though.

Elephant, how do you like the Edge EZ? Just installed mine yesterday. Do you get better MPG?
love the ez. it is a starter box, but really works well for what i use it for which is towing. did see a 2 - 3 mpg increase in fuel mileage as long as i keep my foot out of it. also, from what i have read it is an awesome stack with the smarty, which is what i plan on doing in the near term.

:thumbsup
 

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Discussion Starter #15
love the ez. it is a starter box, but really works well for what i use it for which is towing. did see a 2 - 3 mpg increase in fuel mileage as long as i keep my foot out of it. also, from what i have read it is an awesome stack with the smarty, which is what i plan on doing in the near term.

:thumbsup
Seems like I am getting better MPG with the EZ. What made it even better - bought it on Ebay for $66!!
 

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Your exhaust will actually smell like real diesel exhaust after you rip the kitty.
 

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On a 5.9, NO. And it sounds SSSSWWWWWEEEEEEEEEEETTTTTTTTT. On a 6.7 BIG TIME!!!!!!!!!!(unless you have the proper dummy modules)
 

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T-BONE
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Cummins has the best sounding truck with muffler and cat deletes....HANDS DOWN....but Renee....you live in CA? How you goin to get that monster inspected with no cat? Arent yall real emission strick over there?
 
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