Diesel Place banner
1 - 14 of 14 Posts

Moree30

· Registered
Joined
·
13 Posts
Discussion starter · #1 ·
I have a 2007.5 LMM Duramax ext cab and I have heard you can use lb7 exhaust packages on LMM. I also am thinking about making my own exhaust but first need to get measurements on my length of pipe and angles of pipe need. I want to be able to
Clear the codes the dpf will throw once I take the stock exhaust out from it! Any hints, tips and info would greatly
Appreciated ! Thanks
 
not sure if a LB7 exhaust will work but it would be cheaper to get a delete pipe and get EFI Live to get rid of the DPF...
 
I have heard that the LB7 exhaust will work.
 
Just clearing the codes will not effectively delete the truck. You have to program out the regeneration function, and the pre and post dpf sensors in the ecm. Otherwise you will be constantly getting CEL's
 
The exhaust system I put on my lmm stated it was for a 01-07 crew cab short bed Fit great


Sent from my iPhone using Tapatalk
 
When we deleted my brothers '07.5 we used my factory exhaust from my '02. Problem we had was my truck is a CCLB and my brother's is a ECSB. The front pipe bolted into place and the first couple of hangers worked, but after that we had to cut and splice.

Just my $0.02 worth!
 
Discussion starter · #7 ·
I went ahead and purchased 4" aluminumized pipe from fleet pride. I ran from right after the turbo back. I bought a stainless 3"-4" adapter to bolt the pipe to the existing pipe right after the turbo. I bought a 10' stick of pipe and maybe didn't use about 10" of it. And I used a 45 degree 4" pipe to dump over exhaust and a 90 degree 4" piece of pipe to shoot it out towards the back of the truck at an angle. With a 4"-6" black 15" long tip. It worked out great. I tuned my truck with EFI Live . Sounds great and looks great. Pics soon to come ! Thanks guys for all the help!!
 
Discussion starter · #10 ·
Max5060 I have the DSP 5 switch yes. And I love it !! I attempted the egr blocker plate but boy is that a tough tough thing to do!! The darn firewall is so close to the 2 12mm bolts you need to loosen !! Efi live really opened my LMM up! The guy here close to me in KY gave me a ,econ, heavy tow, tow, street ,race. 40hp, 60hp, 80hp, 100hp, 140 hp. Although the race tune my stock LMM fuel system can keep up with it so I'm going to shim up my fuel pressure relief valve!!! Other then that!! I went from getting 13 in the city to 16. And was getting 24 on highway!!! I love it!!
 
We use the same Flo Pro exhaust system '01-'10 on the Dmax trucks.
 
We use the same Flo Pro exhaust system '01-'10 on the Dmax trucks.
So if i was to just get the pipe that would replace the DPF part of the exhaust would it fit with the stock cat (I plan on gutting) and the stock muffler/pipe assembly. I would take a DPF & cut it off, split it lengthwise, & weld it to the straight pipe along with bungs etc. to make it look like nothing was missing. The smog test guy would then be happy when he looked for the cat & DPF. My concern is the route the new DPF delete pipe would take & if there would be enough room to fit & weld the DPF shell without touching the frame & creating rattles/vibrations. I have a DPF pipe from a CCSB which is shorter than the DPF assembly from my ECLB. I also have the cat from the CCSB which is the same as mine.
 
I just deleted my DPF this week. Wow...what a difference.

I purchased EFI Live from Idaho Rob (DSP5) with 5 tunes: Optimized Stock, +30hp Heavy Tow, +60hp Tow, +90hp Economy, +120hp Economy/Performance.

The EGR is untouched, but disabled. I replaced the exhaust with a Flo Pro 4" Downpipe back exhaust with no CAT, DPF or Muffler. The sound is nice, not to bad IMO.

I have gained about 6 MPG from all my mods, and that's with 35" tires. I just took a 50 mile (mostly highway miles) trip and hand calculated 20MPG. Before that would have been around 14 MPG (at 70 MPG). I'm thrilled with the results. I will be traveling 600 miles on Tuesday. That should give me a better idea.

If I would do it again, I would have purchased the exhaust in three separate pieces that all bolt together with flanges (similar to the OEM parts). I would get a Cat delete pipe (from downpipe) with 4 bolt flange that connects to a DPF delete pipe. Than I would get a Muffler delete pipe with 3 bolt flange to connect to the DPF. Since I have emissions testing every two years, I could just unbolt the cat delete pipe and DPF delete pipe and bolt up the factory ones. Than I would re-flash my ECM with my tuner to return to stock specs. Would probably take me about 1-2 hours. Well worth it once every two years for me. With my exhaust now, it is probably a 3-4 hour job.

I was going to put a blocker plate in the EGR, but I think I am just going to leave it disabled, so I won't have to mess with that every two years since installation/removal is a pain in the ass on the LMM.
 
Gutted the DPF & cat in May on my 2007.5 ECLB & got the same tunes as you. (purchased EFI Live from Idaho Rob (DSP5) with 5 tunes: Optimized Stock, +30hp Heavy Tow, +60hp Tow, +90hp Economy, +120hp Economy/Performance. ) My speedo was off by 5 MPH after I got the tune as tested with a phone app. ATP sent a new tune to correct the speedo. 3000 mile trip over 4th of July week & got about 17.5 to 18.5 mpg. Most of the time the speed limit was 80MPH so I went 85. Slower you go the better the fuel mileage. I am sure I could get 20 MPG at slower speeds – 65 or 70 MPH. I get 16.5 MPG around town now vs 13.5 – 14.0 pre mod. I am overall very pleased with the mod. EGTs are lower and go down faster after the hill pulls with my approximately 2 slide - 12,000 LBS - 38’ toyhauler. Fuel mileage is only abut 1 MPG gain with a load. The greatest achievement is the fact that the engine will last longer without the BS emissions crap on it. I have changed my own oil since day one & have noticed cleaner oil when I change it post mod.
 
1 - 14 of 14 Posts