Description
3.5" High Flow Exhaust Up Pipes & EGR Delete Kit — 2017-2021 Duramax L5P 6.6L
Upgrade your 2017-2021 L5P Duramax with the iFJF High Flow Exhaust Up Pipes & EGR Delete Kit. Engineered with 46% larger flow area over stock, this kit replaces restrictive factory up pipes and cooler components with mandrel-bent 304 stainless steel for maximum exhaust flow and reduced EGTs. Designed for 2017-2021 Chevrolet Silverado/GMC Sierra 2500HD & 3500HD with the 6.6L L5P Duramax diesel.
Key Features
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46% Larger Flow Area: Over restrictive stock pipes — lower EGTs and faster turbo spool
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11-Gauge 304 Stainless Steel: Heavy-duty construction resists cracking and corrosion
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Internally-Sleeved Bellows: 304 stainless internally-sleeved bellows prevent leaks and absorb thermal expansion
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3.5" Mandrel-Bent Tubing: Smooth, unrestricted exhaust flow path
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Complete Kit: Includes up pipes, EGR block-off plates, gaskets, and hardware
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Precision Fit: CNC-machined flanges ensure leak-free seal to turbo and exhaust manifolds
Compatibility
| Year |
Make |
Model |
Engine |
| 2017-2021 |
Chevrolet |
Silverado 2500HD / 3500HD |
6.6L L5P Duramax |
| 2017-2021 |
GMC |
Sierra 2500HD / 3500HD |
6.6L L5P Duramax |
Technical Specifications
| Specification |
Detail |
| Material |
304 Stainless Steel / Aluminum Alloy / Silicone |
| Pipe Diameter |
3.5" (Upgrade over stock 2.5") |
| Pipe Gauge |
11-Gauge (3.0mm wall thickness) |
| Flow Area Increase |
46% over OEM |
| Bellows Type |
Internally-Sleeved 304 Stainless |
| Flange Type |
CNC-Machined Billet |
Why Upgrade to iFJF Up Pipes?
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Lower EGTs: Reduced exhaust backpressure means cooler exhaust gas temperatures — critical for towing
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Eliminate Factory Restrictions: Stock up pipes are undersized and prone to cracking at the bellows
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Complete Solution: Up pipes + block-off plates in one kit — no piecing parts together
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Professional-Grade Construction: TIG-welded joints, mandrel bends, and CNC flanges
Frequently Asked Questions
Q: Will this kit fit my 2019 Silverado 3500HD?
A: Yes, this kit is designed for all 2017-2021 Chevrolet Silverado and GMC Sierra 2500HD/3500HD with the 6.6L L5P Duramax engine.
Q: Do I need tuning after installation?
A: Aftermarket tuning is recommended after installing this kit to optimize engine parameters for the modified exhaust configuration.
Q: Are gaskets included?
A: Yes, all required gaskets and mounting hardware are included in the kit.
Q: What's the difference between this and stock?
A: Stock up pipes are 2.5" with restrictive bends. Our 3.5" mandrel-bent pipes provide 46% more flow area and significantly reduce backpressure.
Q: Is this 50-state legal?
A: This kit is intended for off-road and competition use only. Please check your local regulations before installation.
