Description
Product Overview
The 3" Stainless Downpipe for 2004-2010 Duramax 6.6L LLY LBZ LMM is a performance exhaust upgrade for 2004.5-2010 GM trucks with the 6.6L Duramax diesel. Mandrel-bent 3.0" T304 stainless steel tubing with V-band flange connection eliminates the restrictive factory downpipe for dramatically improved exhaust flow. Expect 10-15 HP gain, faster turbo spool, and lower EGTs.
⚠️ IMPORTANT: OFF-ROAD / COMPETITION USE ONLY. Not for street use on licensed vehicles in California, New York, or CARB states. Verify local regulations before purchase.
Key Features
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3.0" Mandrel-Bent Tubing — Full 3" diameter with smooth mandrel bends. No crush bends or restrictions.
-
T304 Stainless Steel — Premium stainless resists rust and corrosion far better than aluminized steel.
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V-Band Flange — Leak-free seal at turbo outlet. Quick-disconnect simplifies future service.
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10-15 HP Gain — Measurable horsepower and torque gains, especially mid-range where Duramax engines tow.
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Lower EGTs — Reduced backpressure drops EGTs 100-150°F under load.
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Direct Fitment — No cutting, welding, or modification required.
Compatibility Chart
| Year |
Make |
Model |
Engine |
| 2004.5-2010 |
Chevrolet |
Silverado 2500HD |
6.6L Duramax Diesel |
| 2004.5-2010 |
Chevrolet |
Silverado 3500HD |
6.6L Duramax Diesel |
| 2004.5-2010 |
GMC |
Sierra 2500HD |
6.6L Duramax Diesel |
| 2004.5-2010 |
GMC |
Sierra 3500HD |
6.6L Duramax Diesel |
Package Includes
| Component |
Qty |
Details |
| 3" Stainless Downpipe |
1 |
T304 Stainless Steel, 3.0" OD, V-Band |
Specifications
| Spec |
Value |
| Material |
T304 Stainless Steel |
| Diameter |
3.0" OD (Inlet & Outlet) |
| Flange |
V-Band |
| Bend Type |
Mandrel Bent |
| HP Gain |
10-15 HP (Estimated) |
| SKU |
DP-0185 |
Frequently Asked Questions
Q: Will this fit my 2008 LMM Duramax?
A: Yes. Fits all 2004.5-2010 Silverado HD and Sierra HD with 6.6L Duramax — LLY, LBZ, LMM. Check compatibility table.
Q: Do I need a tune?
A: Can be installed without tune. Custom tune maximizes gains, especially with other bolt-on mods.
Q: Is this a DPF/CAT delete pipe?
A: No. This is a turbo downpipe only — replaces factory downpipe from turbo to exhaust connection. Does NOT remove DPF or catalytic converter.
Q: Will this pass emissions?
A: For off-road/competition use only. Not CARB-compliant for on-road use in emissions-testing states.
Q: Can I install myself?
A: Intermediate skills, 2-4 hours. Need sockets, wrenches, penetrating oil. V-band simplifies installation vs bolt-on designs. Professional install recommended.
Related Products
Warranty & Support
12-month warranty. Contact sales@ifjf.cn. US warehouse — 3-7 business days.
Unlock your Duramax's hidden power — upgrade your downpipe today!
