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3.5" Catless Downpipe For 2017-2026 Duramax L5P 6.6L V8 | Suncent®

$ 99.96

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  • 3.5" Catless Downpipe For 2017-2025 Duramax L5P Silverado/Sierra 2500 3500 HD This 3.5-inch Catless Downpipe is specifically designed for 2017-2025 6.6L L5P Duramax diesel models to replace the restrictive factory downpipe. The OEM L5P downpipe causes massive exhaust backpressure and heat buildup due to its dense catalytic converter, restricting the V8 engine's breathing. By removing the catalytic converter and utilizing a smooth, large-diameter exhaust path, this product helps reduce exhaust resistance and improve flow, resulting in faster turbo response, smoother power output, and more direct driving feedback. Core Advantages of This L5P Downpipe1. Reduced Backpressure Factory downpipes are typically narrow, flattened, and restricted by catalysts. This upgrade transforms the setup into a thicker, smoother, catalyst-free straight pipe. This straight-through design minimizes the resistance the engine faces during the exhaust stroke, ensuring unobstructed airflow. 2. Horsepower & Torque Gains Smoother exhaust discharge helps improve boosting efficiency, making acceleration more powerful and torque output more direct. Generally, power can be increased by 10-30 HP. For the L5P diesel engine, the displacement is large and factory restrictions are more severe, making the power gains even more significant. 3. Lower Exhaust Gas Temperature (EGT)Heavy-duty diesel engines like the L5P are frequently used for heavy towing. The factory downpipe easily accumulates heat due to environmental designs, leading to excessively high EGTs. This 3.5-inch catless downpipe quickly channels heat away, lowering EGTs by 100°F - 200°F. This is not just about performance; it prevents turbo burnout and engine power derating caused by overheating. 4. Faster Throttle Response By lowering exhaust backpressure, the turbo blades can spool up faster, significantly shortening turbo lag. Every time you step on the gas, the power feedback is more direct and crisp, eliminating the sluggish, muffled feeling of the factory setup. 5. Exhilarating Turbo WhistleThe L5P has a very pleasant turbo whistle. After installing the 3.5-inch catless L5P downpipe, the whistle becomes crisp and loud, greatly enhancing the mechanical feel and excitement of driving. 6. Improved Fuel Economy Smoother exhaust means reduced engine pumping losses; the engine does not need to consume extra fuel to "push" exhaust gases through a dense catalyst. In the long run, this can provide you with approximately 3% - 5% improvement in fuel mileage. Why Choose SuncentAuto L5P Downpipe304 Stainless SteelOur downpipe is crafted from 304 stainless steel, offering excellent corrosion resistance, high-temperature resistance, and structural strength. It maintains reliable durability and service life even under the high-temperature, high-humidity, and long-term use environments of diesel engines. Catless The catless design eliminates the exhaust restrictions caused by the factory catalytic section, making exhaust discharge more direct and smooth. It is the top choice for those pursuing track performance and off-road passion. 3.5-Inch Diameter Compared to the factory design, which is approximately 3.0 inches with an internal catalyst, the 3.5-inch straight pipe provides a larger cross-sectional area to completely eliminate exhaust backpressure. The Duramax L5P's engine bay is very compact, and a 4-inch exhaust pipe could easily pose a safety hazard during installation. The 3.5-inch large-diameter design achieves an ideal balance between performance and ease of installation. Direct Fit Design Every flange and hanger is precisely calculated. You do not need to modify the factory exhaust routing, making the installation process faster and more effortless. It is perfectly suited as an upgrade component for the original exhaust system. What's Included �� This product kit includes:1 × 3.5" Catless Downpipe2 × Stainless Steel Clamps1 × Exhaust Heat Wrap The stainless steel clamps are used for connecting the exhaust interfaces, ensuring a sealed and stable connection. The heat wrap is used to wrap the downpipe, reducing heat dissipation into the engine bay and protecting surrounding components. Fitment InformationModels: 2017-2025 Chevrolet Silverado 2500/3500 HDModels: 2017-2025 GMC Sierra 2500/3500 HDEngine: 6.6L L5P Duramax Diesel V8 ONLYPlease carefully check the vehicle year, model, and engine information before purchasing.Installation NotesDifficulty Level: Medium-High (Professional technician installation recommended).Installation Time: Approximately 2-3 hours.Tool Requirements: V-band clamp tools and standard socket sets required.Tuner Required: A compatible tuner is required to properly support the catless configuration and prevent warning lights or drivability issues.Note: After installation, it is recommended to check the seal of the connections and the clearance of the entire exhaust system to ensure safety and stability.Warranty & Support We value every user's experience and provide professional after-sales support. If you have fitment questions before purchasing or encounter problems during installation or use, please feel free to contact the Suncent customer service team. We support free shipping in the US and a 45-day hassle-free return service. Important Notice This product is for "Off-Road Use" or "Track Use" ONLY. Please confirm local emissions regulations before purchasing. Our company is not responsible for consequences resulting from improper installation or violation of regulations. FAQs What is the main material of this product?This product is manufactured from 304 stainless steel, featuring excellent high-temperature resistance, corrosion resistance, and durability.Is the installation complicated?This product features a direct-fit design for the corresponding models, offering high installation convenience. However, professional installation is still recommended to ensure proper sealing and fitment.Will this product change the exhaust sound?Yes. After the upgrade, the exhaust note will typically be deeper and fuller, while the turbo sound will become more prominent.Why do some people choose a Catless Downpipe?Because the catless design reduces exhaust restrictions, optimizes exhaust efficiency, and helps improve turbo response and overall driving performance, making it suitable for users pursuing performance upgrades.Is a tuner required?It must be used in conjunction with an ECU tuning program that supports "Delete" functions; otherwise, the vehicle will enter limp mode.How much horsepower can this product add?The hardware replacement alone adds about 10-15 HP; when paired with an ECU tune, gains of over 40 HP can be achieved. Read More

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