Chevy and GMC Duramax Diesel Forum banner


  1. Egr delete ?

    Aftermarket Mods.
    So I’m new to the diesel mechanics I’m no Mechanic myself but as far as bolt up parts go I’m pretty confident I don’t want a race truck just Some more power and for it to souls good I have a stock 09 lmm that just hit 100k truck is very sound and well maintained when it comes to power with our...
  2. Loud High Flow Diesel Particulate Filter (DPF)

    11-16 LML Performance Parts Discussion
    Good Afternoon, I have been searching the archives for for a High Flow Diesel Particulate Filter (DPF) that will offer a louder volume to pass through. I have discovered that Bully Dog has made a performance Diesel Particulate Filter (DPF) for specific generation f0rd and d0dge trucks and I...
  3. Order to do mods?

    EFI Live
    I am fairly new to the Duramax world, but have quite a few hours of reading on here. From my research on here it appears that the V2 is for data logging and retrieving the stock programming for use by a tuner. So, I'm thinking that I need to purchase EFI live first and use the V2 to upload my...
  4. Flappers for 6 inch stacks

    General Discussion
    I have dual 6 inch mitre cut stacks. I'm trying to find some flappers for them. Anyone know where to get them.
  5. MBRP exhaust problems

    How To's, DIY and Write ups
    i recently purchased a 4" mbrp dp back exhaust system part #MBRP-S6004SLM. the retailer i bought it from said it would fit 2001-2010 gm trucks. when i got the exhaust i started reading the directions and they said 2001-2007. will this system work with my 2007.5 lmm?
  6. More lly overheating

    General Discussion
    I understand that there are a ton of threads about lly's overheating but I am looking for suggestions. Our 2004.5 lly silverado duramax started overheating while towing. It carries about 2000 lbs all the time because it is my dads work truck. Semi-regularly we use it to tow an enclosed trailer...
  7. Mods vs. Warranty

    General Discussion
    Ok, so I'm going to start this thread, not for me, but for anyone who may have the same question... what are the pros and cons of modding with aftermarket parts and voiding your warranty, and is it worth it? Also, IF something major were to go out (i.e. tranny, rear end, injector) how much would...
  8. Damn the luck, probably injectors? HELP!!!

    01-04.5 LB7 Duramax Powertrain
    Im seriously ruling out plugged fuel filter, im gonna change it out anyways. On my way home from Denver I noticed my truck was smoking blue-ish white smoke when stopped for an extended period of time. I shut it down checked the oil and noticed it was low a little over a quart. It didn't smell...
  9. Need 06, LBZ stock catalytic converter please

    Looking For/ Wanting To Buy
    Hello, I'm a newbie. I had my duramax stolen a few years back, and had to hire a private investigator to find it. A year later he found it. In Mexico. Needless to say it was my baby and paid to get it back. Well now it's all put back together except the cat they stole and the tow mirrors. All...
  10. is my exhaust system stock?

    04.5-05 LLY Performance Parts Discussion
    I bought my truck from the previous owner without much information. i am fairly new to the diesel world. it is a 2005 lly. it has an aftermarket pmt diesel exhaust tip but i was wonderin if the whole system is aftermarket. how can i find this out? need to know because i am looking into efi live
  11. LB7 straight pipe

    General Discussion
    I am looking at putting a straight pipe on my pickup. right now i dont have the money to do anything too extreme right now. im looking at just cutting out the muffler and putting 3.5 inch exhaust pipe in place of it. i am just wondering if it sounds much different or if it is even worth doing...
  12. 4" dual turbo back diamond eye exhaust

    Performance Upgrades
    Just purchased this exhaust and it appears to only be front pipe back, i have an 03. Can I do 4" from the turbo back or is it necisarry? Thanks in advance :drink
  13. 2011 GMC 2500 LML Exhaust Options

    Performance Upgrades
    I recently bought a 2011 GMC 2500 Duramax. I've worked at Lou's Custom Exhaust for the last eight years and I've done a million diesel systems. However, I've never seen anything like the exhaust on my truck because it has the diesel exhaust fluid injector. I'm stumped on where to start, not...
  14. New duramax owner, advice please... Exhaust, programmers

    06-07 LBZ & LLY Performance Parts Discussion
    Hi I recently purchased an 06 duramax with the lly engine. Its bone stock. I wanna take the mpg's up because I'm tired of drivin my 05 with the 6.0 vortec @ 11 mpg. That being said I need advice on duramax stuff. Programmers... What do I need to know? I'm not worried about hp cuz the engine and...
  15. 2011 Denali HD

    11-16 LML Duramax Powertrain
    I just got word that my 2011 GMC Denali HD will have it's last build date on December 13 and has an approximate delivery date of December 23.. MERRY CHRISTMAS TO ME!!!! I will only be doing minor mods to it (window tint, smoked roof markers, etc.) but one thing I was very curious about was my...
  16. straight exhaust questions

    Performance Upgrades
    ok so my truck is going to the exhaust shop on saturday and i have a few questions i have my edge evo race, should i have any problems with doing a straight pipe? the ediots at the exhaust shop when i took it by there to get a estimate that if i took the cat off that it would catch on fire:rofl...
  17. Exhaust Help.....newbie

    2007.5 + (GMT 900) Non Powertrain New Body Style
    Hey guys. I have a 2008 Lmm and I am looking for a solid exhaust system. It seems as though a MBRP turbo back is the way to go but everywhere I call says that MBRP does not make a turbo back for the Lmm. Also, I am worried about passing smog inspections (It says online that Alabama does not...
  18. Single Stack or Leave It Alone...

    07.5-10 LMM Performance Parts Discussion
    I'm sure that this has been asked before, but I couldn't find the response I was looking for. I currently have a 4" MBRP straight pipe exhaust on my truck with a 6" tip. I was never really crazy about trucks with stacks, especially single stacks. But after going tomultiple truck pulls and...
  19. Straight Pipe EGT Drop 3.5"

    Performance Upgrades
    I have seen this question asked several times on this forum but with no real answer so I thought I would go ahead and remove my muffler, straight pipe my truck, and see what difference I see in EGT's so here it is. Driving around 70 on the freeway my egt's use to sit around 700-800 depending on...
  20. Cat Back Stack or Turbo Back Stack? Which is better for Engine/Turbo Longevity

    06-07 LBZ & LLY Duramax Powertrain
    Hey Fellas, I just installed a cat to a 7 inch miter stack on my 07 lbz. I am pretty disappointed with the sound thanks to that good o'l tree hugger OEM catalytic converter. So I am real close to buying a front pipe to make it a turbo back system straight all the way. I'm new to diesels and how...