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Duramax Second Generation: 2004.5-2005 (LLY) Discuss the second generation (2004.5-2005 LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion belongs in Third Generation forum due to the differences of the 2006 LLY and the 2004.5-2005 LLY. Engine related discussion ONLY.

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Old 10-21-2005, 07:44 AM   #11 (permalink)
Idle_Chatter
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Originally Posted by benburke View Post
Forgive me but I don't see how bad the down pipe is. Can you show it with an arrow pointing to it, or something?
Look closely at the middle picture in the second set. See the big flattened downpipe? It's mashed and dented to clear the firewall at the rear of the engine. Not to mention that it has a twisted rectangular "box" that bolts to the rear of the turbo housing at the top. That's why there's so much controversy about vendors that advertise a "turbo back" or "includes turbo downpipe" in their exhaust systems.

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"To summarize, we conclude that the Second Amendment protects an individual right to keep and bear arms. That right existed prior to the formation of the new government under the Constitution and was premised on the private use of arms for activities such as hunting and self-defense, the latter being understood as resistance to either private lawlessness or the depredations of a tyrannical government (or a threat from abroad)."

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Old 10-21-2005, 08:24 AM   #12 (permalink)
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this one has an arrow. Thanks Briano, very useful

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Old 10-21-2005, 08:27 AM   #13 (permalink)
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Is the Lb7 downpipe the same?
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Old 10-21-2005, 08:29 AM   #14 (permalink)
dmaxalliTech
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no, LB7 d-pipe is different. Attatches to turbo in a different manner
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Old 10-21-2005, 08:38 AM   #15 (permalink)
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Eric, does it appear to be less resistive?
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Old 10-21-2005, 08:52 AM   #16 (permalink)
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Does the EGR feed tube (arrow) branch from the downpipe? Can't really see it.
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Old 10-21-2005, 09:02 AM   #17 (permalink)
dmaxalliTech
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all the factory downpipes are pretty restrictive, I have some downpipes laying around, I 'll find them and get some pics up. The EGR pipe attatches to the up pipe on the passanger side, the down pipe is cleanranced around that so it makes it tighter in there
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Old 10-21-2005, 09:13 AM   #18 (permalink)
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Very cool.

Is the turbo spooled off the driver side exhaust only? I feel like I'm in gradeschool.

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Old 10-21-2005, 09:28 AM   #19 (permalink)
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Disregard the above question. It makes sense there are probably 2 up pipes joined to feed the turbine.

What bugs me now is that EGR flow appears to be drawn from the pass side only. Was not aware of this before.
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Old 10-21-2005, 03:09 PM   #20 (permalink)
Idle_Chatter
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I can't be sure, but it looks like the EGR comes up from pretty close to where the two up pipes join the lower turbo housing, killerbee. That should make it pretty "50/50" or at least as much as it can be with the EGR cooler being mounted on the passenger side.

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"To summarize, we conclude that the Second Amendment protects an individual right to keep and bear arms. That right existed prior to the formation of the new government under the Constitution and was premised on the private use of arms for activities such as hunting and self-defense, the latter being understood as resistance to either private lawlessness or the depredations of a tyrannical government (or a threat from abroad)."

United States Court of Appeals for the District of Columbia -- March 9, 2007
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