Duramax Diesels Forum Truck of the Week
  #1  
Old 03-12-2010, 06:43 AM
nick1camper nick1camper is offline
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Default does an LLY have a DPF?

Hey guys. Recently sold my LB7 and upgraded to an LLY. I was wondering, does it have a DPF or is what I am seeing in the exhaust just a cat? Also, If I remove the front pipe can it be replaced with one from an LB7?
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Old 03-12-2010, 06:46 AM
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No an LLY doesn't have a DPF. Yes the weird can thing on the front pipe is a catalytic converter. Can't answer the one about LB7 downpipe though. Hope that helps
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Old 03-12-2010, 06:49 AM
KEVINL KEVINL is offline
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Quote:
Originally Posted by nick1camper View Post
If I remove the front pipe can it be replaced with one from an LB7?
yes it will bolt in
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Old 03-12-2010, 06:55 AM
nick1camper nick1camper is offline
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Cool. Will it make a difference in the way it runs or the mpg if I remove it? I think I can get my hands on a stock LB7 pipe that doesn't have the cat. If it won't help I won't worry about it though.
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Old 03-12-2010, 07:00 AM
KEVINL KEVINL is offline
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the cat is the biggest restriction so it will make it run better but I think you will get a code. might need a finger stick

Someone else will know for sure.
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Old 03-12-2010, 07:02 AM
nick1camper nick1camper is offline
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Quote:
Originally Posted by KEVINL View Post
the cat is the biggest restriction so it will make it run better but I think you will get a code. might need a finger stick

Someone else will know for sure.
IC. I have been thinking about an EGR block off plate and a finger stick as well. May as well get it done! Thanks for the info!
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Old 03-12-2010, 08:16 AM
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mbrp also sells cat delete front pipes for a little over 100 bucks...

rarely will you get a code but it is possible....i would do the egr block and cat delete and if it throws a code then get the fingerstick....n my experience ive found that most dont unless its a cali or MA truck.

and yes it is worth ditching the cat... that makes more of a difference then the whole rest of the exhaust IMHO
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Old 03-12-2010, 08:53 AM
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the factory muffler is worse than the cat
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Old 03-12-2010, 08:59 AM
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i run with a cat an no muffler first....sound changed only a little..egts barely moved either.

dumped the cat and it was a whole different ball game....just what happened in my case..
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Old 03-12-2010, 09:04 AM
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for a moment i forgot these things have all tha garbage
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Old 03-13-2010, 04:55 AM
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05' Ditry Duramax 05' Ditry Duramax is offline
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Quote:
Originally Posted by TeaBagger2006 View Post
for a moment i forgot these things have all tha garbage
Me too. I don't even remember what all that stuff did when I ripped it off. I took all that out day 2 after delivery.

If you take the CAT out I think you might get a 0404 and a 0401 code (I can't remeber). It will not set the CEL but they will be in there forever. Maybe if the truck is a CA truck it might set the CEL.
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Old 03-13-2010, 06:35 AM
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Mine never got any codes at all even dormant ones. I ran straightpipe and an egr plate on stock ECM tuning
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Old 03-13-2010, 06:57 AM
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Myn popped a code immediatly... Went to the drag strip and made a couple passes and it disappeared and never came back on... Seems like ripping on it made it recalibrate....
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Old 03-13-2010, 07:53 AM
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Quote:
Originally Posted by 05' Ditry Duramax View Post
Me too. I don't even remember what all that stuff did when I ripped it off. I took all that out day 2 after delivery.

If you take the CAT out I think you might get a 0404 and a 0401 code (I can't remeber). It will not set the CEL but they will be in there forever. Maybe if the truck is a CA truck it might set the CEL.
Exactly. If it's a Federal Emissions truck (it would have FE9 on the RPO tag), it may set codes but shouldn't set a CEL. If it's a CA/NE truck (RPO NE1), it'll probably set codes and a CEL.
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Old 03-13-2010, 10:16 PM
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Quote:
Originally Posted by Cougar281 View Post
Exactly. If it's a Federal Emissions truck (it would have FE9 on the RPO tag), it may set codes but shouldn't set a CEL. If it's a CA/NE truck (RPO NE1), it'll probably set codes and a CEL.
That's what I thought. i couldn't remeber exactly though. I'm not going to go back and dig thru a crap ton of old threads.
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