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Description
6.6L Duramax LMM Downpipe Back Exhaust | GM 2007.5-2010Introduction Unleash the full potential of your 6. 6L Duramax with the GM Duramax LMM Downpipe Back Exhaust System, built for 2007. 52010 Chevrolet Silverado and GMC Sierra 2500 3500HD models. Available in both 4 inch and 5 inch diameters, this system maximizes exhaust flow, reduces EGTs and delivers a deep, aggressive tone for serious off road performance. Vehicle Compatibility Years: 2007. 5 2010 Makes: Chevrolet Silverado, GMC Sierra Models:
Introduction
Unleash the full potential of your 6.6L Duramax with the GM Duramax LMM Downpipe-Back Exhaust System, built for 2007.5–2010 Chevrolet Silverado and GMC Sierra 2500/3500HD models. Available in both 4-inch and 5-inch diameters, this system maximizes exhaust flow, reduces EGTs and delivers a deep, aggressive tone for serious off-road performance.
Vehicle Compatibility
- Years: 2007.5-2010
- Makes: Chevrolet Silverado, GMC Sierra
- Models: 2500HD, 3500HD
- Engine: 6.6L Duramax LMM (diesel)
- Body: Pickup
- Cab Styles: Extra Cab (EC), Crew Cab (CC)
- Box Lengths: Short Box (SB), Long Box (LB)
- Configuration: Single Rear Wheel (SRW) and Dually (DRW)
Please Note: Not compatible with Cab & Chassis or 3-bolt flange models
Technical Specifications
- Material: 16-gauge T409 stainless steel
- Diameter: 4” or 5” mandrel-bent tubing
- Configuration: Downpipe-back, single outlet
- Clamps: Stainless steel band clamps
- Finish: Natural brushed stainless
- Use: Off-road and race applications only
Features
- Performance downpipe-back design for maximum flow
- Offered in 4" and 5" T409 stainless steel for strength and longevity
- 16-gauge stainless construction resists corrosion and fatigue
- Contour Bent Hangers ensure precise, rattle-free alignment
- Stainless steel clamps provide leak-free joints
- Prewelded flanges and contour bends simplify installation
- No bungs for a clean, unrestricted design
- Fits Cab/Box configurations: EC-CC/SB-LB-Dually
- Ease of installation with all hardware included
- Optional muffler add-on available for quieter operation
Benefits
- Frees up exhaust flow for noticeable performance gains
- Lowers EGTs under heavy load and towing
- Reduces backpressure, improving throttle response
- Durable T409 stainless withstands high-heat, high-vibration use
- Straightforward bolt-on setup for minimal downtime
- Delivers a powerful, deep exhaust tone ideal for off-road builds
Installation & Notes
- Bolt-on design—no welding or cutting required
- Uses Contour Bent Hangers for factory-style alignment
- Professional installation recommended for fit and clearance
- Must be paired with proper race tuning to function correctly
- For competition/off-road use only
Frequently Asked Questions
Q1: Is this exhaust street-legal?
A1: No. It is for off-road or race use only and not legal on public highways.
Q2: What’s the difference between 4” and 5” Duramax LMM exhaust?
A2: The 4” provides excellent fitment and moderate tone; the 5” offers deeper sound and maximum flow.
Q3: Does Duramax LMM exhaust include all necessary hardware?
A3: Yes. Includes clamps, Contour Bent Hangers and all mounting hardware.
Q4: Do I need tuning after installation?
A4: Yes. Proper race tuning is required for the system to function correctly.
Q5: Will Duramax LMM Exhaust System lower EGTs?
A5: Yes. The free-flowing design reduces backpressure and lowers exhaust gas temperatures for better off-road performance.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy