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3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 0
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3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 0
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 1
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 2
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 3
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 4
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 5
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 6
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 7
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 0
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 1
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 2
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 3
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 4
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 5
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 6
3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel 7

3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel

SKU: 3494EMD0165US
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3.5" Catless Downpipe For 2017-2025 Duramax L5P 6.6L V8 | Vigor Diesel
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Brand
Vigor Diesel
Pipe Diameter
3.5 inch
Fitment
2017-2025 GMC Sierra 3500 HD 6.6L V8
Material
Stainless Steel
Condition
100% New
Surface
Mirror Polish

  • Robust Construction: Manufactured from corrosion-resistant stainless steel, this Vigor Diesel exhaust component withstands heat, moisture, and road debris, supporting consistent flow and durability in demanding diesel environments.
  • Direct Fit Design: Engineered with precision bends and OE-style routing, hangers, and connections, the system installs cleanly without modification, reducing labor time for garages and DIY truck owners alike.
  • Power Efficiency Gains: By lowering exhaust restriction, the design helps unlock added horsepower and torque, improves throttle response, and can support better fuel efficiency during towing or heavy-duty driving.
  • Dedicated Support: Backed by responsive after-sale assistance, Vigor Diesel provides customer support to address fitment, installation, or usage questions, ensuring long-term confidence and ownership value.

Title

3.5" Catless Downpipe For 2017-2025 Silverado/Sierra 2500 3500 HD 6.6L L5P Duramax Diesel V8

Advantages of a catless downpipe
All-New Acceleration Experience
A cat-deleted exhaust system can simultaneously boost torque and reduce weight, delivering a significant acceleration improvement—shortening the 0-60 mph acceleration time by approximately 0.3-0.4 seconds.
Faster Turbo and Throttle Response
By removing the catalytic converter, exhaust backpressure is dramatically reduced and hot gases no longer accumulate in the turbo housing. This lowers the turbocharger’s operating temperature, cutting turbo lag and throttle response time by approximately 10–15%.
Improved Fuel Economy
By reducing exhaust backpressure, more air enters the combustion chamber, significantly enhancing fuel combustion efficiency and increasing fuel mileage by up to 5%. Whether for daily driving or track competition, it delivers more economical performance.
Deep, Resonant Exhaust Note
At idle and low RPM, the mid-to-low frequency rumble becomes richer and more robust. A light tap of the throttle unleashes a powerful turbo whistle and sharp exhaust bursts.
Reduced Failure Rate
The catalytic converter is a wear-prone component. By removing it, the exhaust system is simplified, effectively lowering the likelihood of failures.
Application

2017-2025 GMC Sierra 2500 3500 HD

2017-2025 Chevrolet Silverado 2500 3500 HD

2017+ 6.6L L5P Duramax Diesel V8

Why remove the catalytic converter?
After removing the catalytic converter, exhaust gases can be discharged from the turbo more freely, effectively reducing heat buildup and lowering the turbo's operating temperature. At the same time, exhaust backpressure is significantly reduced, markedly improving engine intake efficiency—while gaining more torque and horsepower, fuel combustion becomes more complete. This allows you to fully unleash the passion of ultimate performance on the track, while also saving considerable fuel costs.
WARNING
FOR RACING USE ONLY
NOT LEGAL FOR USE IN THE U.S. ON PUBLIC ROADS
CLEAN AIR ACT NON‑COMPLIANT.

NOT LEGAL FOR USE ON ANY PUBLIC ROADS OR HIGHWAYS IN THE UNITED STATES.

USE ON U.S. PUBLIC ROADS OR NON‑SANCTIONED RACING IS STRICTLY PROHIBITED.

  • Legal use is limited to OFFICIALLY SANCTIONED COMPETITION VEHICLES.
  • Compliance with LOCAL EMISSIONS AND ENVIRONMENTAL LAWS is the sole responsibility of the end user. Improper use may result in FINES, PENALTIES OR VEHICLE NON COMPLIANCE.
About Vigor Diesel
Vigor Diesel is a diesel performance brand focused on providing practical, application-oriented solutions for modern diesel trucks. Our products are developed with real-world driving conditions in mind, including off-road operations, racing, and towing.
Each product is carefully engineered to simplify common emissions system issues while improving serviceability and overall user experience. Vigor Diesel products are intended for legally permitted off-road and racing applications.

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