I see MBRP has filter back exhaust systems for the 08's but I want to do away with the DPF and DOC which I assume a turbo back will do correct? I do not see a turbo back system out there for the LMM's yet but I surely could be missing something. I will be using the Quad Stealth 2 most likely on a very basic tune to add a few horses but more for economy and get rid of regen. Live in FL in the sticks where the EPA does not nag us yet.

It is illegal to remove smog related items and you won't see a kit for turbo back on LMM. You have to get a kit for 07 classic LLY? I think, from what I've read that will work on the LMM, thats what I plan on buying for my truck..

PS Do a search, there are TONS Of threads on this topic out there...

03 duramax exhaust is the ticket

The correct MBRP part number for the 4" system that fits the LMM is the 6004xxx, where xxx is the pipe material IE: 304SS, 409SS, etc.

I went with the 6004409 complete kit from the turbo back. That kit is listed for an '06, but its blowin' black smoke on my '08 LMM right now :D

The correct MBRP part number for the 4" system that fits the LMM is the 6004xxx, where xxx is the pipe material IE: 304SS, 409SS, etc.

I went with the 6004409 complete kit from the turbo back. That kit is listed for an '06, but its blowin' black smoke on my '08 LMM right now :D


Chromer, do you have any pics of the kit installed? and when you say it's blowin black smoke, is that stock or with a tune... I want to do this but I don't really want a lot of smoke, and did it just bolt right up, all the hangers matched up and stuff, or did you have to modify the hangers and mounting points.

The correct MBRP part number for the 4" system that fits the LMM is the 6004xxx, where xxx is the pipe material IE: 304SS, 409SS, etc.

I went with the 6004409 complete kit from the turbo back. That kit is listed for an '06, but its blowin' black smoke on my '08 LMM right now :D


10-4, very much modification involved to make it fit? I have a 4" lift if that matters much. Does the 6004xxx add some length to the exhaust? How is the sound?

Thanks

Chromer, do you have any pics of the kit installed? and when you say it's blowin black smoke, is that stock or with a tune... I want to do this but I don't really want a lot of smoke, and did it just bolt right up, all the hangers matched up and stuff, or did you have to modify the hangers and mounting points.

Look in my garage. There is a picture of the tailpipe and one of the muffler thru the rear wheel well. I am running a small No DPF tune from my Quad, but I embellish when I say it's blowin' black smoke. The Quad does not smoke much unless you are WOT, and even then it's not much at all. It's a very civilized tune, and for the money, I think it was the best buy out there for getting rid of DPF codes.

As far as sound, the MBRP is very civil, also. That is the nature of a turbocharged engine, actually. The turbo vanes act as a pseudo muffler, and again, unless you are WOT, the exhaust sound is not a lot louder than stock. I also have a turbocharged car with a flowmaster, and it is reasonably quiet also unless I stand on it. One thing you do need to be aware of, though, is that if you go with a turbo back exhaust, regardless of brand, you are going to have a VERY distinct hissing sound from your tailpipe at idle. The variable vane geometry of the turbo by design creates a significant restriction at the turbo at closed throttle, and these things at idle sound like a friggin' jet fighter waiting to take off. It's not loud, per se, but it is very noticeable, and it took me a while to get used to it. It's kind of grown on me, though.

As far as modifications to the exhaust for installation, the MBRP kit was a breeze to install. I did have to cut 9" off an extension pipe, per the MBRP instructions, but that is only on an extended cab. I believe if you have a crew cab, the entire system bolts right up.

Hope this helps...

One thing you do need to be aware of, though, is that if you go with a turbo back exhaust, regardless of brand, you are going to have a VERY distinct hissing sound from your tailpipe at idle. The variable vane geometry of the turbo by design creates a significant restriction at the turbo at closed throttle, and these things at idle sound like a friggin' jet fighter waiting to take off. It's not loud, per se, but it is very noticeable, and it took me a while to get used to it. It's kind of grown on me, though.



you can get rid of that in the tune, at least as far as at idle, low rpms.

Jody

you can get rid of that in the tune, at least as far as at idle, low rpms.

Jody

Yeah, I know...

But the EFILive is out of my price range :(

Like I said, its kinda growin on me. Plus, it's a nice conversation starter. "Whadda F%#@ is THAT?"

Chromer, do you have any pics of the kit installed? and when you say it's blowin black smoke, is that stock or with a tune... I want to do this but I don't really want a lot of smoke, and did it just bolt right up, all the hangers matched up and stuff, or did you have to modify the hangers and mounting points.
Look at this thread:

http://www.dieselplace.com/forum/showthread.php?t=197360&highlight=tbyrne

Look at this thread:

http://www.dieselplace.com/forum/showthread.php?t=197360&highlight=tbyrne


I read this whole thread... even replied, and PM'd & Called Tom with no response...

Chromer! thanks for the response that's exactly what I was looking for. Got 650 on the clock now, about 1k or so (depending on $$) I'll invest in an exhaust and a Quadzilla

It is illegal to remove smog related items and you won't see a kit for turbo back on LMM. You have to get a kit for 07 classic LLY? I think, from what I've read that will work on the LMM, thats what I plan on buying for my truck..

PS Do a search, there are TONS Of threads on this topic out there...

Yeah, I hear this all the time. What exactly is the law that is being broken? I've looked here, "Googled" and checked other sites without success. Plenty of people refer to huge fines, but it seems like everybody is just parroting what they have heard. Nobody has cited a law.

I'm wondering if it is a CRIME to replace the exhaust or just a rule violation which can result in a fine and/or order to replace it.

Yeah, I hear this all the time. What exactly is the law that is being broken. I've looked here, "Googled" and checked other sites without success. Plenty of people refer to huge fines, but nobody has cited a law. I'm wondering if it is a CRIME to replace the exhaust or just a rule violation which can result in a fine and/or order to replace it.


I know it's been done all the time, my "It's illegal" response was to why MBRP does not offer a Turbo Back kit for the LMM. That's like going in to the local muffler shop and asking them to remove the cat for you.... sure some do it, but if they get caught they can get in trouble.

I read this whole thread... even replied, and PM'd & Called Tom with no response...

Chromer! thanks for the response that's exactly what I was looking for. Got 650 on the clock now, about 1k or so (depending on $$) I'll invest in an exhaust and a Quadzilla

You're welcome. Its a good combo; you will enjoy it. Good luck

Yeah, I hear this all the time. What exactly is the law that is being broken? I've looked here, "Googled" and checked other sites without success. Plenty of people refer to huge fines, but it seems like everybody is just parroting what they have heard. Nobody has cited a law.

I'm wondering if it is a CRIME to replace the exhaust or just a rule violation which can result in a fine and/or order to replace it.

http://www.epa.gov/enforcement/civil/caa/caaenfstatreq.html

It's the clean air act that covers smog equipment and testing. The link above is a good read, and you're nuts if you don't think they will fine you. It's a federal law, not state by state, so it's illegal to remove or tamper with any of the emission equipment on a car or truck in any state. It's a money-making deal, and they like to bring in money. The list of fines to people and companies on the California EPA board was extensive; companies like Saleen, Jesse James, and tons of small guys like you and me.

Here's a quote from the link above:

Clean Air Act Enforcement
EPA may issue an order to any person or company who violates the Clean Air Act. The order may impose a civil penalty plus recovery of any economic benefit of non-compliance and may also require correction of the violation.

Who must comply with the Clean Air Act?Manufacturers, repairers, consumers.

What are the penalties for noncompliance?Penalties for violation of stationary source requirements, fuels requirements, or most motor vehicle emission requirements (by a company or dealer) may be up to $27,500 per violation (per day or per motor vehicle/ engine). Violations of the tampering requirements (by a person other than a company or dealer), or defeat device provisions by anyone may incur penalties of up to $2,750 per vehicle or engine.

Jody

For CA residents, 27156(b) VC would apply and explain it:


27156. (a) No person shall operate or leave standing upon ( )1 a highway ( )2 a motor vehicle that is a gross polluter, as defined in Section 39032.5 of the Health and Safety Code.
(b) No person shall operate or leave standing upon ( )1 a highway ( )2 a motor vehicle that is required to be equipped with a motor vehicle pollution control device under Part 5 (commencing with Section 43000) of Division 26 of the Health and Safety Code or any other certified motor vehicle pollution control device required by any other state law or any rule or regulation adopted pursuant to that law, or required to be equipped with a motor vehicle pollution control device pursuant to the National Emission Standards Act (42 U.S.C. ( )3 7521 to 7550, inclusive) and the standards and regulations adopted pursuant to that federal act, unless the motor vehicle is equipped with the required motor vehicle pollution control device ( )4 that is correctly installed and in operating condition. No person shall disconnect, modify, or alter any such required device.

http://www.epa.gov/enforcement/civil/caa/caaenfstatreq.html

It's the clean air act that covers smog equipment and testing. The link above is a good read, and you're nuts if you don't think they will fine you. It's a federal law, not state by state, so it's illegal to remove or tamper with any of the emission equipment on a car or truck in any state. It's a money-making deal, and they like to bring in money. The list of fines to people and companies on the California EPA board was extensive; companies like Saleen, Jesse James, and tons of small guys like you and me.

Here's a quote from the link above:

Clean Air Act Enforcement
EPA may issue an order to any person or company who violates the Clean Air Act. The order may impose a civil penalty plus recovery of any economic benefit of non-compliance and may also require correction of the violation.

Who must comply with the Clean Air Act?Manufacturers, repairers, consumers.

What are the penalties for noncompliance?Penalties for violation of stationary source requirements, fuels requirements, or most motor vehicle emission requirements (by a company or dealer) may be up to $27,500 per violation (per day or per motor vehicle/ engine). Violations of the tampering requirements (by a person other than a company or dealer), or defeat device provisions by anyone may incur penalties of up to $2,750 per vehicle or engine.

Jody


Thanks, Jody. That's helpful, as is the above reference to california law :)

You're welcome. Its a good combo; you will enjoy it. Good luck

Hey, Chromer, did you install the EGR-blocker-plate too? Is THAT worth it?

Hey, Chromer, did you install the EGR-blocker-plate too? Is THAT worth it?

absolutely, depending on how much boost you run. 28 psi or so and above it needs to be blocked. The day before the plate was installed in exact same weather conditions (even the exact same starting area on the same road) the truck went 12.75 0-100 mph. The next day with the egr blocked it went 12.31 0-100. Also, a lot less smoke than before, which further proves that the egr was getting blown open and diluting the intake with exhaust (which has no oxygen, making the tune richer and slower). The rail is only pulled down 5-6%, little smoke once rolling, and pulling 3000+ pulsewidth throughout the run. After the egr blocker I added the Diamond Eye downpipe and picked up even more, to the tune of 11.936 0-100 mph.

I have been datalogging changes on my truck on the same deserted road, same starting position, and the same 0-100 mph runs since I started modding. It at least gives me an idea of how tuning changes affect the truck, along with hard parts changes. You can see trends, often surprising. Some tuning changes have really picked up the bottom end but got lazy up top, whereas others are the opposite. The datalog feature of EFI Live is incredibly important to see changes, either from 0-100, or 0-60, 60-80, 80-100, etc. I check them all so I know if I'm moving in the right direction. You also need to try to keep the setting the same which is why I always use the same road, start at the same place, run the same direction, etc.

Back to point, I had the egr off in the tune and was not convinced that it needed to be blocked. I was wrong........... :o:

Jody

Hey, Chromer, did you install the EGR-blocker-plate too? Is THAT worth it?

I did not block the EGR, and my truck will never run a 1/4 mile. For me, this entire exercise has been about efficiency and MPG's. I have no inherent dislike of the emissions systems and I have no problem with a functioning EGR valve. After 1000 miles and piss-poor fuel economy, I felt the DPF system was an inherently flawed design which put too much of a burden on fuel usage, and thats why I made the changes.

This is my work truck/office. 1/4 mile times are of no interest to me. For those that do have an interest in all-out performance, a lot of fun stuff can be done, but not my truck

I did not block the EGR, and my truck will never run a 1/4 mile. For me, this entire exercise has been about efficiency and MPG's. I have no inherent dislike of the emissions systems and I have no problem with a functioning EGR valve. After 1000 miles and piss-poor fuel economy, I felt the DPF system was an inherently flawed design which put too much of a burden on fuel usage, and thats why I made the changes.

This is my work truck/office. 1/4 mile times are of no interest to me. For those that do have an interest in all-out performance, a lot of fun stuff can be done, but not my truck


I agree, and go out of my way to try to keep the egr on. If my setup was a tow-type I'd do the same as you. The egr doesn't function under wot anyway, but that's with the stock boost levels. With 28+ it does function under wot anyway, and it is not designed or supposed to. GM never intended egr at wot on gas or diesel engines, but the higher boost levels cause that to happen even though there's no signal from the ecm to open the valve.

Jody

I did not block the EGR, and my truck will never run a 1/4 mile. For me, this entire exercise has been about efficiency and MPG's. I have no inherent dislike of the emissions systems and I have no problem with a functioning EGR valve. After 1000 miles and piss-poor fuel economy, I felt the DPF system was an inherently flawed design which put too much of a burden on fuel usage, and thats why I made the changes.

This is my work truck/office. 1/4 mile times are of no interest to me. For those that do have an interest in all-out performance, a lot of fun stuff can be done, but not my truck
Agreed. Now my only concern is if this kit will work with my lift kit, rear sway bar and airbags (already have the Quad Stealth). Should would be nice to see a photo of the exhaust from the center of the rear bumper forward. This would help me gauge if it should clear the other items.

Of course if someone is already running this setup and knows it will fit then I'm game.