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  1. Aftermarket Mods.
    I have a 2011 Chevy 6.6. In search of the best exhaust system to get but don’t want to deal with programming. Just looking for sound and if it betters the performance great if not then oh well. Thanks.
  2. General Discussion
    Hi there I have a 2016 GMC 2500HD This is my first diesel truck, I love it. Hated the emissions, bad fuel milage, and the stupid DEF tank hanging below waiting to get ripped off on my first hunting trip 150KM from the nearest town. So a month after buying the truck I deleted it and blocked...
  3. Looking For/ Wanting To Buy
    Apparently the jackwagon that owned this truck before me cut the cat off. Does anyone have one laying around? (Doesn't need to be functional BTW, just pass a visual check.)
  4. Introductions
    Hello all! I finally got the truck of my dreams having custom ordered, from the factory a 2021 2500 HD, CrewCab, 4x4, Z71. As of today it has 1227 miles on it and from day one there has been issues. 1st issue was pulling to the left which has now been back to the dealer twice and is still...
  5. Looking For/ Wanting To Buy
    Just looking for after market exhaust manifolds, and down pipe for my 2005 GMC Sierra 2500HD. Thanks Leonard [email protected]
  6. Maintenance
    Hello all. I have a 2015 GMC Sierra 2500HD with the Duramax 6.6 with 163k miles. A few months ago the message on the dash started popping up letting me know the DPF was being cleaned and to keep driving. Then a few weeks ago it started reducing power. I've got an ash problem that the regen can't...
  7. 06-07 LBZ & LLY Performance Parts Discussion
    I want to get a new exhaust for my lbz but I won't be making big power for another year or so. I dont want to short myself and get a 4 inch cat back because I will want the turbo back eventually. Ive heard it can cause more lag in lower rpms. Is this true? Is there any other red flags with this?
  8. 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...
  9. 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...
  10. 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...
  11. 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.
  12. 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?
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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
  18. 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...
  19. 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
  20. 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...