2019 Chevy Duramax Delete Parts: Which Ones Actually Fit Your L5P

Your 2019 Silverado or Sierra HD runs the 6.6L Duramax L5P. That engine code, not the Duramax badge, is what decides which delete parts actually bolt up. Get it wrong and you're the guy holding a part that won't fit on install day.

Here's the thing — not every part in this lineup does the same job. Which one your build needs comes down to how much hardware you want gone from under the hood. Let's break it down truck by truck, part by part, so you get it right the first time.

Which Delete Parts Fit Your 2019 Silverado or Sierra Duramax?

The 5" Down Pipe-Back Full Exhaust Delete bolts up to a 2019 L5P. This fits the 2017 through 2023 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD with the 6.6L Duramax, all pickup cab and box lengths. The DPF & CAT Delete Pipe fits 2017 through 2023 L5P trucks. The EGR Delete Kit fits 2017 through 2023 L5P trucks. The 3.5" Downpipe fits 2017 through 2023 L5P trucks.

All Four Parts Cover 2017 Through 2023

The good news? Your 2019 sits right in the middle of every bracket here, so model year is the easy half of this check. Here's the whole lineup on one screen.

Model year only settles half of the fitment question, though. The other half is what sits behind the cab, so slow down here.

Pickup Vs. Cab & Chassis: The Second Fitment Check

Start with the 5" Down Pipe-Back Full Exhaust Delete, which covers a 2019 L5P pickup. It does not fit Cab & Chassis trucks.

The DPF & CAT Delete Pipe covers a 2019 L5P too. These pipes are designed for PICKUP MODELS. Cab&Chassis models will require modifications to be made for the pipe to fit.

The EGR Delete Kit covers a 2019 L5P as well. This is compatible with all 2017–2023 Chevrolet Silverado and GMC Sierra Duramax pickup models.

The 3.5" Downpipe covers a 2019 L5P, with one condition. Also called the turbo direct pipe, it fits the Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD with the 6.6L Duramax L5P — pickup trucks only.

Pickup or Cab & Chassis? Sort that out on the bench, before the old exhaust comes off, and install day stays a bolt-on job instead of turning into a parts hunt with the truck already up in the air.

What Does Each Part In This Lineup Actually Remove?

The 3.5" Downpipe bolts to the L5P. This pipe starts at the turbocharger and fully removes the DOC for the best airflow and power gains. The EGR Delete Kit fits the L5P too. The 5" Down Pipe-Back Full Exhaust Delete is built for the L5P. The DPF & CAT Delete Pipe is an L5P part. Eliminate the following components • Diesel Particulate Filter (DPF) • Catalytic Converter (CAT)

And the muffler? Retains Factory Muffler

DPF, CAT And DOC: Which Part Takes Out Which

Three different letters, three different jobs, and mixing them up is how you end up with the wrong part for what you actually wanted gone. Would you rather swap the whole exhaust than pull two parts out of it? The 5" Downpipe-Back DPF Delete Exhaust for the 2017–2023 L5P Duramax removes the Diesel Particulate Filter (DPF) and catalytic converter (CAT) from your Silverado or Sierra — ending forced regen cycles, cutting backpressure, and opening up flow with a 5" T-409 stainless steel pipe.

The DOC is a different story. Both DPF delete pipes and full exhaust systems start behind the Diesel Oxidation Catalyst, leaving it installed for emissions-on setups. That one detail clears up a lot of the confusion you hear in the pits.

Why The EGR Kit Is A Separate Purchase From The Exhaust

Here's where a lot of guys get tripped up. The EGR Delete Kit for the 2017–2023 L5P Duramax permanently removes the Exhaust Gas Recirculation (EGR) system from your Silverado or Sierra — ending the soot buildup, stuck valves, and hot exhaust gases that keep getting re-routed back into your engine.

Every cycle, the EGR pushes hot, dirty exhaust into a clean intake manifold, laying down soot on the valves and manifold walls. Deleting the EGR stops that cycle cold and lets the engine run clean.

So treat it as its own line item on the build sheet, not a bonus that rides along with a pipe. Pulling the DPF and leaving the EGR alone is like fixing a leaky roof on one side of the house and ignoring the other.

What GM's 6.6L Duramax Supplements Say About The DPF

Before you pull anything, it helps to know what the factory setup is actually doing. If your truck has the Duramax diesel engine, GM sends you to the Duramax diesel supplement for additional and specific information on this engine.^[1]

The L5P's emissions controls include Cooled Exhaust Gas Recirculation (EGR) and a Diesel Particulate Filter (DPF).^[3] The Duramax engine is equipped with a Diesel Particulate Filter (DPF) that will filter or trap particulates.^[2] The DPF is under the vehicle in the exhaust system.^[2]

The DPF will clean itself as part of normal operation.^[5] It's picky about timing, though. The DPF system is not capable of self-cleaning at idle.^[4]

You'll hear it when it happens.^[5] During self-cleaning there will be a change in the exhaust sound and engine idle speed.^[5]

Some trucks also get a manual option. The manual regeneration feature is only available on Fleet and Commercial vehicles.^[5] If equipped, manual regeneration cleans the DPF when it is unable to clean itself.^[5]

There's a threshold on it, too. Manual regeneration can only be used when the DPF has become at least 90% full.^[4]

Why The 3.5-Inch Downpipe Is The Odd One Out

The 3.5" Turbocharger Downpipe for the 2017–2023 L5P Duramax removes the DOC (Diesel Oxidation Catalyst) and increases exhaust flow straight out of the turbo, improving performance. It completely eliminates the DOC and is built for maximum flow in competition applications — and on its own, it won't affect your emissions systems.

Think of it as the first link in the chain rather than a swap further down the line. Keep that picture in mind when you map out the rest of the exhaust.

Does The Name Duramax Alone Tell You Enough?

The eighth character in the VIN is the engine code.^[6] The L5P is a 6.6L V-8 Turbo-Diesel.^[3] The DPF & CAT Delete Pipe fits the L5P. The 5" Down Pipe-Back Full Exhaust Delete fits the L5P. The EGR Delete Kit fits the L5P. The 3.5" Downpipe fits the L5P.

What The L5P Engine Code Means

Duramax is the family name. L5P is GM's code for the 6.6L V-8 Turbo-Diesel itself.^[3] That's the code to match before anything else, because the family name on its own doesn't narrow it down.

Confirming Your Engine Code Before You Order

Your VIN settles it.^[2] Count to the eighth character of your VIN, because GM uses that spot for the engine code.^[2] A quick look now beats a part on the bench that won't bolt up.

Why The Badge Isn't The Fitment Check

A badge tells you the family the engine belongs to. It doesn't tell a parts counter which specific engine actually sits under your hood, and that's the whole reason a badge alone isn't enough to go on. That engine code is the number to go find.^[2]

Do You Still Need A Tune After Installing These Parts?

The 5" Down Pipe-Back Full Exhaust Delete suits the L5P. You'll need a compatible delete tune to keep DPF codes away. The EGR Delete Kit is an L5P part. You'll also need a compatible delete tune to update your ECM — the hardware alone won't keep check engine codes away, since the computer still expects the EGR to be working. The 3.5" Downpipe fits the L5P too.

It's the piece you need to fully strip the emissions system, but it isn't required for a delete tune to function. Read that sentence twice, because it answers a narrower question than most guys think it does.

Why The EGR Kit Needs A Tune

Think of it this way — the hardware and the computer have to agree. Do one without the other and the job isn't done, no matter how clean the install looks. Budget for both halves before the first bolt comes out.

What To Tell Whoever Writes Your Tune

Each part gets its own answer here, and they aren't interchangeable. Walk in with a list of exactly what came off the truck, and the calibration conversation gets a lot shorter.

DPF, CAT, EGR, DOC: write down which ones are gone before you make the call. Whoever writes the file needs the whole picture, not the half you remembered at the counter, and a clear list is how you end up with a calibration that matches the hardware actually bolted to your truck.

Buying The Tune As A Separate Step

Plan on the tune as its own line item on the build sheet. Buying the hardware without lining up the tune is like buying the engine and skipping the fuel — one half of the job doesn't move without the other. Line up your calibration source before the hardware shows up, not after it's already sitting on the bench waiting on a computer that isn't ready for it.

Ask about turnaround when you book it, too. A tune you're still waiting on is the difference between the truck being ready for the next event and sitting on stands for another week.

Which System Should You Choose For Your Truck?

The DPF & CAT Delete Pipe is priced from $599.00 to $687.00. The 5" Down Pipe-Back Full Exhaust Delete is priced from $929.00 to $999.00. This system runs from the downpipe back, replacing the OEM DPF and CAT sections with a free-flowing pipe in a larger diameter. The EGR Delete Kit is priced at $349.00. The 3.5" Downpipe is priced at $449.00.

5" Down Pipe-Back Full Exhaust Delete

It's the best-selling Duramax 5" full exhaust, and it bolts on across all cab and box lengths. Pick it when you want the most factory exhaust gone in one piece.

DPF & CAT Delete Pipe

It fits 2017 through 2023 L5P trucks. Pick it when the DPF and CAT are all you want gone and you'd rather keep the factory muffler.

EGR Delete Kit

It's the best-selling Duramax EGR delete kit and a DIY-friendly install. Pair it with whichever exhaust piece you land on.

3.5" Downpipe

This fits the 2017, 2018, 2019, 2020, 2021, 2022, and 2023 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD with the 6.6L Duramax L5P. Save it for the build that has to flow everything it can.

Matching Price To How Much You Are Removing

Let's put it plainly. If all you want gone is the DPF and the CAT, the DPF & CAT Delete Pipe is the best bang for your buck on a 2019 L5P. Want the fullest exhaust swap instead?

For a 2019 L5P competition build, the 5" Down Pipe-Back Full Exhaust Delete is our pick. The L5P is a powerful engine, and the DPF is one of the main things holding it back.

Think about where the build is headed, not just where it sits today. If the truck is going to end up with a full exhaust anyway, doing it in two steps means paying for the job twice, and nobody likes pulling the same section off a truck they only just finished.

Pairing The EGR Kit With An Exhaust Part

Whichever exhaust piece you choose, pair it with the EGR Delete Kit. One without the other is half a build.

Want the fullest strip this lineup can give you? Start with the 5" Down Pipe-Back Full Exhaust Delete. Then add the EGR Delete Kit. Round it out with the 3.5" Downpipe. That's the whole build, start to finish.

When The 3.5-Inch Downpipe Is Worth Adding

Want every last bit of restriction gone? Then the 3.5" Downpipe belongs on the list.

If you're not chasing every last bit of flow on the dyno, it can wait until the rest of the build is sorted. Your dyno sheet will tell you when it's time.

What Should You Expect During Installation On A 2019 L5P?

On a 2017-2019 L5P, the CAN bus plugs must be installed. The 5" Down Pipe-Back Full Exhaust Delete fits the 2019 L5P. The EGR Delete Kit includes all hardware and gaskets. The 3.5" Downpipe is built for the L5P. It comes with heat wrap to keep engine bay temperatures down and improve heat retention, and it mounts with a 4-bolt flange that ships with two studs already installed.

The CAN Bus Plugs

The CAN bus plugs must be installed.

Hardware And Help That Come With Each Part

Here's what shows up with each part, so you're not scrambling at the parts store mid-install. Going the full-length route? T-409 stainless gives you better corrosion resistance than aluminized steel, and the OEM-style hangers and clamps mount it securely.

Keeping the factory muffler instead? We send you a step-by-step instruction guide and have a full time support staff to help you with any questions you may have on the installation.

Doing the EGR at the same time? The kit physically blocks off the EGR circuit and includes all the hardware and gaskets, so there's nothing to source separately.

Bench Check Before The Truck Goes Up

Check every part against the parts list before you start. Do it on the bench, in good light, before anything comes off the truck.

Lay the pieces out in the order they'll go on, and the job reads like a map. A missing clamp found on the bench is a quick fix; found under the truck with the old pipe already off, it's a lost afternoon.

Give the truck the same once-over. Let the exhaust cool all the way down before a wrench touches it, soak anything that looks rusted, and keep the old hardware bagged and labeled until the new parts are on and the truck has made a few pulls on the dyno.

What Else Should You Know Before You Order?

All exhaust systems and DPF/CAT delete pipes are final sale and not eligible for a refund or return. The DPF & CAT Delete Pipe fits an L5P. The 5" Down Pipe-Back Full Exhaust Delete fits an L5P. The EGR Delete Kit fits an L5P. 30-day return policy while unused — once installed, returns aren't accepted. The 3.5" Downpipe fits an L5P.

Final-Sale Terms On The Exhaust Pieces

Here's the straight version, before the box is open rather than after. Final sale sounds scary. However, if you receive a faulty product or the wrong product, we will send you a replacement.

Shipping is free, exhaust systems are final sale, and a damaged or wrong system gets replaced at no cost. That's exactly why the engine-code and cab checks up top carry so much weight.

Know the difference between a replacement and a return going in. It'll save you an awkward phone call later, and it keeps the conversation about the part instead of the paperwork.

Return Terms On The EGR Kit

Going the EGR route? Orders process within 1 business day with 4–8 business day standard shipping, and the kit carries a 30-day return policy while unused — once installed, returns aren't accepted.

Open the box, check the parts, and hold off on the wrenches until you're sure. That habit costs you nothing and can save you a return.

Who To Call Before You Order

Not sure which bracket or cab configuration you're in? Settle it before the truck goes up on stands, not after. For more information, please reach out to our sales team PHONE : (888) 830-2588 Ext 2

Have your VIN handy when you call, and know whether your truck is a pickup or a Cab & Chassis before you dial. One phone call beats digging through product pages on your phone in the shop.