If you own an LML Duramax and you've started looking into DPF delete pipes, you've probably run into a confusing situation. There are two different kits for what seems like the same truck. One says it fits 2011-2015 with a V-band clamp. Another says it fits 2015.5-2016 with a 3-bolt flange.
When I first started researching for my 2012 LML, I had no idea there was a difference. I figured a DPF delete pipe was a DPF delete pipe. Turns out, that's not the case at all. The turbo outlet connection changed mid-2015, and if you order the wrong one, you're going to have a bad time.
I ended up going with a TruckTok 4" DPF delete pipe for my truck, and after helping a friend order the right one for his 2016, I learned a lot about what makes these kits different. Here's what I found.
The LML Duramax Context
The LML Duramax ran from 2011 through 2016, and it was a big step forward for GM. It introduced a more complex emissions system with DEF injection and a larger DPF. The engine itself is solid—strong bottom end, good fuel system, plenty of power potential.
But like all modern diesels, the emissions equipment comes with compromises. The DPF creates backpressure that your turbo has to fight. Regeneration cycles burn fuel that doesn't move you down the road. And eventually, the DPF fills with ash and needs expensive replacement.
For a lot of owners, deleting the DPF makes sense. But you have to get the right parts for your specific truck.
The V-Band vs 3-Bolt Confusion
Here's where it gets tricky. From 2011 through early 2015, the LML used a V-band clamp to connect the downpipe to the turbo outlet. It's a simple, effective design that's easy to work with.
Sometime in mid-2015, GM changed things. The later 2015 models and all 2016 trucks switched to a 3-bolt flange at the turbo outlet. Same engine, same turbo, but a different connection.
If you have a 2015, you need to know which one you've got before ordering parts. A V-band kit won't fit a 3-bolt truck, and a 3-bolt kit won't fit a V-band truck.
Why TruckTok?
I'd seen TruckTok mentioned in a few Duramax forums. The feedback was solid, and their prices were reasonable compared to some of the bigger names.
Their 4" DPF delete pipes come in two versions—one for the V-band trucks and one for the 3-bolt trucks. That's important because it means they've engineered each kit specifically for that flange type.
Both pipes are made from T-409 stainless steel. That's the right material for exhaust—it handles heat well and resists corrosion without costing as much as T-304. A lot of people get confused because T-409 is magnetic and T-304 isn't, but magnetic doesn't mean cheap. T-409 is perfectly suited for exhaust applications.
Both pipes include a muffler too. That's a nice touch because a lot of delete pipes are straight-through race pipes that drone on the highway. With the muffler, you get the performance gains without the annoying noise.
What You Gain After Installation
After installing the pipe on my 2012 and getting a proper tune, the differences were immediate.
Lower EGTs: This was the biggest change. With exhaust flowing freely, temperatures under load dropped significantly. Towing my trailer up grades, I saw EGTs about 150-200°F lower than before. That's less stress on the engine and turbo.
Better throttle response: The turbo spools faster without having to push exhaust through a restriction. The truck feels livelier off the line and responds quicker when you step on it.
Fuel economy improvement: No more regen cycles burning fuel. My average MPG went up by about 4-5 miles per gallon. The product description mentions going from 13-14 MPG to 18-19 MPG, and that's been pretty accurate for my mixed driving.
No more regen anxiety: I don't think about regenerations anymore. No watching the dash, no worrying about interrupting a cycle when I shut the truck off.
Eliminated a future expense: That DPF replacement that was coming at 150,000 miles? Not an issue anymore.
Original Style Hangers Make Installation Easy
One thing I really appreciated about the TruckTok pipe was the original style hangers. They match the factory mounting points perfectly, so the pipe hangs exactly where it should. No rattling, no fighting to get things aligned, no weird vibrations.
The downpipe-back design means you're replacing everything from the turbo outlet to the tailpipe. Comprehensive coverage for maximum benefit.
Common Questions
How do I know which flange I have?
Look at the connection right at the turbo outlet. If it's a wide metal band with a T-bolt clamp, that's V-band. If it's a flat flange with three bolts, that's the 3-bolt style. If you have a 2015, you need to check. It's not enough to just know the year.
Is it loud with the muffler?
Not at all. It's deeper than stock and you can hear the turbo more, but it's not annoying on the highway. The muffler tames the exhaust note without restricting flow.
Do I really need a tuner?
Absolutely. The pipe alone won't work. The truck's computer monitors the DPF system using sensors for differential pressure, exhaust temperature, and soot load. When it detects the DPF is missing, it will set codes, light up your dash, and derate power.
You need a delete tune to disable that monitoring and optimize the engine for the new exhaust flow. TruckTok recommends the Mini Maxx tuner, which is a solid choice for the LML. Without a tune, the hardware is useless.
Will it pass inspection?
This is for off-road use only. In states with emissions testing, a deleted truck won't pass. Know your local laws before buying.
Does it fit my truck?
The V-band kit fits 2011-2015 LML trucks with the V-band clamp. The 3-bolt kit fits 2015.5-2016 LML trucks with the 3-bolt flange. Both fit short bed and long bed crew cabs. Neither fits cab and chassis trucks.
What's in the box?
The pipe, clamps, and hardware. Everything you need for installation.
How hard is it to install?
It's straightforward if you're comfortable with exhaust work. The factory DPF is heavy, so having a second person or a jack helps. Expect to spend a few hours on it. The OE-style hangers make alignment easy.
Is the fuel mileage gain real?
Yes, but it depends on your driving. The product description mentions going from 13-14 MPG to 18-19 MPG. That's been accurate for my mixed driving. If you have big tires or a heavy foot, your results may vary, but the improvement is real.
Why T-409 stainless?
T-409 is the standard for quality exhaust components. It's durable, heat-resistant, and corrosion-resistant. It's magnetic, which confuses some people, but that's normal for this grade of stainless. It'll outlast your truck.
The Verdict
The LML Duramax is a great engine, but the factory DPF system holds it back. It adds backpressure, wastes fuel on regens, and comes with an expensive replacement timeline.
The TruckTok 4" DPF Delete Pipe with muffler solves all of that. It lets the engine breathe, lowers EGTs, improves fuel economy by 4-5 MPG, and eliminates a future expense. And with the muffler, you get the performance without the drone.
Just make sure you get the right version for your truck. Check that turbo outlet flange before you order. V-band or 3-bolt? Know which one you have.
Paired with a proper tune from a Mini Maxx or similar tuner, this is one of the best upgrades you can make to an LML Duramax. The power gains are real, the fuel savings add up, and the truck just drives better.
If you're on the fence about deleting your LML, this pipe is worth a serious look.
When I first started researching for my 2012 LML, I had no idea there was a difference. I figured a DPF delete pipe was a DPF delete pipe. Turns out, that's not the case at all. The turbo outlet connection changed mid-2015, and if you order the wrong one, you're going to have a bad time.
I ended up going with a TruckTok 4" DPF delete pipe for my truck, and after helping a friend order the right one for his 2016, I learned a lot about what makes these kits different. Here's what I found.
The LML Duramax Context
The LML Duramax ran from 2011 through 2016, and it was a big step forward for GM. It introduced a more complex emissions system with DEF injection and a larger DPF. The engine itself is solid—strong bottom end, good fuel system, plenty of power potential.
But like all modern diesels, the emissions equipment comes with compromises. The DPF creates backpressure that your turbo has to fight. Regeneration cycles burn fuel that doesn't move you down the road. And eventually, the DPF fills with ash and needs expensive replacement.
For a lot of owners, deleting the DPF makes sense. But you have to get the right parts for your specific truck.
The V-Band vs 3-Bolt Confusion
Here's where it gets tricky. From 2011 through early 2015, the LML used a V-band clamp to connect the downpipe to the turbo outlet. It's a simple, effective design that's easy to work with.
Sometime in mid-2015, GM changed things. The later 2015 models and all 2016 trucks switched to a 3-bolt flange at the turbo outlet. Same engine, same turbo, but a different connection.
If you have a 2015, you need to know which one you've got before ordering parts. A V-band kit won't fit a 3-bolt truck, and a 3-bolt kit won't fit a V-band truck.
Why TruckTok?
I'd seen TruckTok mentioned in a few Duramax forums. The feedback was solid, and their prices were reasonable compared to some of the bigger names.
Their 4" DPF delete pipes come in two versions—one for the V-band trucks and one for the 3-bolt trucks. That's important because it means they've engineered each kit specifically for that flange type.
Both pipes are made from T-409 stainless steel. That's the right material for exhaust—it handles heat well and resists corrosion without costing as much as T-304. A lot of people get confused because T-409 is magnetic and T-304 isn't, but magnetic doesn't mean cheap. T-409 is perfectly suited for exhaust applications.
Both pipes include a muffler too. That's a nice touch because a lot of delete pipes are straight-through race pipes that drone on the highway. With the muffler, you get the performance gains without the annoying noise.
What You Gain After Installation
After installing the pipe on my 2012 and getting a proper tune, the differences were immediate.
Lower EGTs: This was the biggest change. With exhaust flowing freely, temperatures under load dropped significantly. Towing my trailer up grades, I saw EGTs about 150-200°F lower than before. That's less stress on the engine and turbo.
Better throttle response: The turbo spools faster without having to push exhaust through a restriction. The truck feels livelier off the line and responds quicker when you step on it.
Fuel economy improvement: No more regen cycles burning fuel. My average MPG went up by about 4-5 miles per gallon. The product description mentions going from 13-14 MPG to 18-19 MPG, and that's been pretty accurate for my mixed driving.
No more regen anxiety: I don't think about regenerations anymore. No watching the dash, no worrying about interrupting a cycle when I shut the truck off.
Eliminated a future expense: That DPF replacement that was coming at 150,000 miles? Not an issue anymore.
Original Style Hangers Make Installation Easy
One thing I really appreciated about the TruckTok pipe was the original style hangers. They match the factory mounting points perfectly, so the pipe hangs exactly where it should. No rattling, no fighting to get things aligned, no weird vibrations.
The downpipe-back design means you're replacing everything from the turbo outlet to the tailpipe. Comprehensive coverage for maximum benefit.
Common Questions
How do I know which flange I have?
Look at the connection right at the turbo outlet. If it's a wide metal band with a T-bolt clamp, that's V-band. If it's a flat flange with three bolts, that's the 3-bolt style. If you have a 2015, you need to check. It's not enough to just know the year.
Is it loud with the muffler?
Not at all. It's deeper than stock and you can hear the turbo more, but it's not annoying on the highway. The muffler tames the exhaust note without restricting flow.
Do I really need a tuner?
Absolutely. The pipe alone won't work. The truck's computer monitors the DPF system using sensors for differential pressure, exhaust temperature, and soot load. When it detects the DPF is missing, it will set codes, light up your dash, and derate power.
You need a delete tune to disable that monitoring and optimize the engine for the new exhaust flow. TruckTok recommends the Mini Maxx tuner, which is a solid choice for the LML. Without a tune, the hardware is useless.
Will it pass inspection?
This is for off-road use only. In states with emissions testing, a deleted truck won't pass. Know your local laws before buying.
Does it fit my truck?
The V-band kit fits 2011-2015 LML trucks with the V-band clamp. The 3-bolt kit fits 2015.5-2016 LML trucks with the 3-bolt flange. Both fit short bed and long bed crew cabs. Neither fits cab and chassis trucks.
What's in the box?
The pipe, clamps, and hardware. Everything you need for installation.
How hard is it to install?
It's straightforward if you're comfortable with exhaust work. The factory DPF is heavy, so having a second person or a jack helps. Expect to spend a few hours on it. The OE-style hangers make alignment easy.
Is the fuel mileage gain real?
Yes, but it depends on your driving. The product description mentions going from 13-14 MPG to 18-19 MPG. That's been accurate for my mixed driving. If you have big tires or a heavy foot, your results may vary, but the improvement is real.
Why T-409 stainless?
T-409 is the standard for quality exhaust components. It's durable, heat-resistant, and corrosion-resistant. It's magnetic, which confuses some people, but that's normal for this grade of stainless. It'll outlast your truck.
The Verdict
The LML Duramax is a great engine, but the factory DPF system holds it back. It adds backpressure, wastes fuel on regens, and comes with an expensive replacement timeline.
The TruckTok 4" DPF Delete Pipe with muffler solves all of that. It lets the engine breathe, lowers EGTs, improves fuel economy by 4-5 MPG, and eliminates a future expense. And with the muffler, you get the performance without the drone.
Just make sure you get the right version for your truck. Check that turbo outlet flange before you order. V-band or 3-bolt? Know which one you have.
Paired with a proper tune from a Mini Maxx or similar tuner, this is one of the best upgrades you can make to an LML Duramax. The power gains are real, the fuel savings add up, and the truck just drives better.
If you're on the fence about deleting your LML, this pipe is worth a serious look.
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