It’s more responsive in the pedal.
6.6L Duramax L5P CAT & DPF Delete Pipe | 2017–2026 GMC/Chevy
409 Stainless Steel
Regular price
$349.00
Regular price
Sale price
$349.00
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GM Duramax L5P, 6.6L (2017 - 2026)
6.6L Duramax L5P CAT & DPF Delete Pipe | 2017–2026 GMC/Chevy
6.6L Duramax L5P CAT & DPF Delete Pipe | 2017–2026 GMC/Chevy
SKU: SKU:DPSS-GM-17
Regular price
$349.00
Regular price
Sale price
$349.00
Quantity
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Overview
This GM Duramax L5P Cat & DPF Delete Pipe is designed to replace the restrictive factory emissions section on 2017–2026 6.6L Duramax pickup trucks. By removing the catalytic converter and DPF assembly, this Duramax L5P delete pipe allows exhaust gases to exit the turbocharger with significantly less restriction. The result is improved exhaust flow, reduced backpressure, and a cleaner path for performance-oriented tuning applications.
Compatibility
- Years: 2017–2026
- Makes: Chevrolet, GMC
- Models: Silverado 2500HD, Silverado 3500HD, Sierra 2500HD, Sierra 3500HD
- Engine: 6.6L Duramax L5P Diesel
- Important: Fits pickup trucks only. Does not fit 3500/4500/5500 Cab & Chassis models. Cab & Chassis trucks use a different exhaust configuration.
Technical Specifications
| Specification | Detail |
|---|---|
| Pipe Diameter | 4' Mandrel-Bent Exhaust Tubing |
| Material Options | T-304 Stainless Steel or T-409 Stainless Steel |
| Construction | Mandrel-bent tubing for consistent internal diameter and exhaust flow |
| Connection Type | Direct-fit replacement for factory catalytic converter and DPF section |
| Mounting | Uses factory hanger locations |
Key Features & Build Details
- 4' Mandrel-Bent Exhaust Tubing – Maintains a consistent internal diameter throughout the pipe to reduce turbulence and improve overall exhaust gas evacuation from the turbo.
- Dual Stainless Steel Material Options – Available in T-304 stainless steel for maximum corrosion resistance or T-409 stainless steel for a more economical option while still maintaining durability.
- Direct Replacement Design – Built to replace the factory catalytic converter and DPF section, maintaining proper routing under the truck while using OEM hanger locations.
- Full Emissions Section Removal – Eliminates the restrictive catalytic converter and diesel particulate filter assembly commonly known to create exhaust backpressure on tuned trucks.
Performance Benefits
- Reduced Exhaust Backpressure – Removing the factory DPF and catalytic converter significantly improves exhaust flow, helping the turbo operate more efficiently.
- Improved Turbo Response – Less restriction after the turbo allows exhaust gases to exit faster, which can help improve turbo spool characteristics.
- Lower Exhaust Gas Temperatures – Improved exhaust flow can help stabilize EGT levels during heavy load or towing situations when paired with proper tuning.
- Supports Performance Tuning – Provides the necessary exhaust configuration required for off-road race tuning on L5P Duramax trucks.
Installation Notes
Direct-fit exhaust section designed to replace the factory catalytic converter and DPF assembly. Installs using standard exhaust tools and factory mounting locations. Professional installation is recommended, and ECM tuning is required to prevent emissions-related fault codes after installation.
Frequently Asked Questions
Will this fit a 2019 or 2024 L5P Duramax truck?
Yes. This pipe fits 2017–2026 Chevrolet Silverado and GMC Sierra 2500HD and 3500HD pickup trucks equipped with the 6.6L L5P Duramax engine.
Does this fit Cab & Chassis trucks like the 3500HD, 4500 or 5500?
No. Cab & Chassis trucks use a different exhaust configuration. This pipe is designed specifically for pickup models only.
What is the difference between T-304 and T-409 stainless steel?
T-304 stainless offers higher corrosion resistance and is preferred for trucks operating in wet or salted environments. T-409 stainless is more cost-effective while still providing solid durability for normal use.
Is tuning required after installing this pipe?
Yes. Since this pipe removes the factory emissions components, proper ECU tuning is required to prevent check engine lights and ensure correct engine operation.
Does the kit include hardware?
The pipe is designed to integrate with factory mounting points and exhaust hangers. Installation typically reuses factory clamps and mounting locations depending on the existing exhaust configuration.
2017-2026 Chevy Duramax L5P 6.6L Silverado 2500 / 35002017-2026 GMC Duramax L5P 6.6L Sierra 2500 / 3500Does not fit 3500 / 4500 / 5500 Cab & Chassis models
Shipping Policy at Tuner Depot
At Tuner Depot, we understand the importance of timely delivery for your performance parts. We're committed to ensuring a seamless shipping experience, striving to dispatch your orders with utmost efficiency and speed.
Our Shipping Policy: Our aim is to dispatch all orders within two business days, providing you with a quick and efficient processing time. However, unforeseen circumstances beyond our control may occasionally impact shipping times.
Factors Affecting Shipping:
- Weather Conditions: Adverse weather conditions such as rain, snow, or sleet may affect delivery timelines. We will make every effort to minimize any delays.
- Holiday Periods: Please note that our shipping center will be closed during holidays. We will resume shipping promptly on the next business day. Allow for potential delays during peak seasons, but rest assured, we will keep you informed every step of the way.
- Staff Availability: Unforeseen circumstances can occasionally affect our staffing levels, possibly leading to minor delays. We are committed to swiftly resolving any issues to maintain our high standards of service.
We genuinely appreciate your understanding and patience during any unexpected obstacles. Be assured that we will utilize every resource available to deliver your performance parts promptly.
Items Eligible for Return
These items can be returned within 30 days of the purchase date, provided they are unopened, unused, and in their original packaging:
- Tuning devices – for example, an unopened/unused Mini Maxx V1/V2 or blank EFI Live Device
- Cables and device accessories – for example, an unopened/unused switch, bypass cable, universal pyrometer & docking station
Final Sale / Non-Refundable Items
The following items are final sale and cannot be returned:
- Custom tuning – including additional tune files purchased separately or custom tuning purchased with a device
- Exhausts and race pipes – this also includes downpipes purchased separately from an exhaust or race pipe
- EGR kits
Manufacturer Warranty
All items we sell include a 90-day manufacturer warranty.
If an item is being returned due to a manufacturer defect, it may be returned for a full refund, exchange, or replacement with a similar item of equal or lesser value.
For eligible items being returned for any other reason, the same options apply: full refund, exchange, or replacement with a similar item of equal or lesser value, provided the item meets the return requirements above.
Return Process
All returns must be approved by our team before being sent back. We will provide a valid RMA number and prepaid return label for the return.
Please do not send any items back without an approved RMA and the return label provided by us, as returns sent without these will not be accepted or processed.
Off-Road Use Only
These products are intended for off-road, race, and competition use only and may not be legal for use on public highways where emissions laws apply. Check your local and state regulations before purchase.
Customer Reviews
Overall rating: 4.6 / 5 from 179 reviews.
Fitment wasn’t the greatest could improve a lot
6.6L Duramax L5P 5 Inch Downpipe-Back Exhaust System | 2017–2026
Tuner depot was very helpful I thought I screwed up on the tune part and flashing the ecm but there customer service told me I didn’t mess it up and helped me through it but one thing for sure is nothing to do with tuner depot but no one every tells you on a first time doing one of these trucks the amount of hours it takes it took me almost 30 hours which if I had the right tools and confidence I could of probably cut it down to about 20 but kit works great it’s got awesome power now and I’ll be doing the down pipe very soon to I highly recommend just buying it and getting it over with because the truck is still very quiet almost like it’s a notch above stock
GM Duramax L5P All-In-One DPF/DEF/EGR Delete Kit (2017-2025)
Just got them installed on my truck yesterday and cannot believe the increase in performance! Can’t wait to take it on a road trip already see more power increase and fuel mileage. Unbelievable would do it again tomorrow!
Love the sound of the straight exhaust especially on the Dirtymax they just sound badass without a muffler
I purchased the efi live sotf tunes along with Dpf delete kit, dpf was good quality, tuner worked with me and not only sent my autocal loaded with a sotf tune but also sent me a few single tunes to use until I installed the switch, the only negative was that 130hp was the max power tune single or switch on the fly, but over all I was pretty happy and service was very good throughout.
The ordering process was easy, the parts came fast and the response from the team has been incredible!
6.6L Duramax L5P 5 Inch Downpipe-Back Exhaust System | 2017–2026
Love it
still waiting
nice sound without drawing unwanted attention
6 weeks was to long without updates
6.6L Duramax L5P Cold Air Intake | 2017-2026 Sierra/ Silverado
Very easy to work with! Everything fit as it should
6.6L Duramax L5P 5 Inch Downpipe-Back Exhaust System | 2017–2026
Pretty easy to install, works great
Works s expected
Great product
Timely delivery, great product NOT cheap junk.
L5P Downpipe 3.5 Inch Turbo Direct Pipe | 2017-2026 GMC Chevrolet
Thank you!
Great communication
Sounds great easy installation
6.6L Duramax L5P 5 Inch Downpipe-Back Exhaust System | 2017–2026
Did not fix on the fling correctly where the downpipe sits and was pushing upwards towards frame
6.6L Duramax L5P CAT & DPF Delete Pipe | 2017–2026 GMC/Chevy
Pretty straight forward install
6.6L Duramax L5P 5 Inch Downpipe-Back Exhaust System | 2017–2026
Helped quiet down the straight 4" pipe
Should come with clamps
Everything went smooth and lined up great just wish it would’ve came with instructions
6.6L Duramax L5P 5 Inch Downpipe-Back Exhaust System | 2017–2026
Customer service absolutely sucks!!!!
Great product
L5P Downpipe 3.5 Inch Turbo Direct Pipe | 2017-2026 GMC Chevrolet
Worked and fit as expected
Perfect sound
Could have come with some kind of directions. Made it through it ok but a little direction would have been nice. Overall everything works as it should.
Sounds great not to loud
Before installing never had a code after install getting low fuel rail pressure code under load. If I keep RPMs up just a little ( by switching to manual shift and never come out of 5 gear Allison 6 speed trans) will work fine . If u shift to 6th gear lower RPM as soon as u go up a little incline it starves for fuel and goes into reduced power mode. But if u mash the excelsior and down shifts it will take off like a rocket.
Worked perfectly.
6.6L Duramax L5P 5 Inch Downpipe-Back Exhaust System | 2017–2025
Sounds good.
I received a product that was very different from what I ordered, and I have tried to contact you but haven't received a response.
6.6L Duramax L5P Cold Air Intake | 2017-2026 Sierra/ Silverado
Truck has a nice rumble but not excessively load like a straight pipe.
Muffler has great sound, no restrictions. The best part of the whole deal was the outstanding service and shipping that Tuner Depot provided. Would definitely use them again.
Fit was very good and looks great on my vehicle.
6.6L Duramax L5P 5 Inch Downpipe-Back Exhaust System | 2017–2025
Sound is exactly what I was looking for.
Was a little nervous if it was going to show up, nice quality and ease of install would purchase again
GM Duramax 6.6L - Shibby Engineering Tuner Harness Plug Kit (2011-2023)
Excellent
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