DIESELR Downpipe Back Exhaust - Single (2001-2007 GM 2500/3500 6.6L Duramax LB7/LLY/LBZ)
DIESELR Downpipe Back Exhaust - Single (2001-2007 GM 2500/3500 6.6L Duramax LB7/LLY/LBZ) - 5" / No Muffler is backordered and will ship as soon as it is back in stock.
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DIESELR Downpipe Back Exhaust - Single (2001-2007 GM 2500/3500 6.6L...
DIESELR Downpipe Back Exhaust - Single (2001-2007 GM 2500/3500 6.6L Duramax LB7/LLY/LBZ) - 5" / No Muffler is backordered and will ship as soon as it is back in stock.
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Description
Description
The Right Downpipe-Back Exhaust for Your LB7 or LBZ Duramax
If you own a 2001–2007 GM 2500 or 3500 with the 6.6L Duramax LB7, LLY, or LBZ engine, the factory exhaust is holding your truck back. The Dieselr LB7 LBZ Duramax Downpipe-Back Exhaust replaces restrictive OEM piping with a full mandrel-bent T409 stainless system — built for better airflow, lower EGTs, and long-haul reliability.
This isn’t a universal kit. It’s built specifically for your Duramax.
Built to Outperform: Why Dieselr’s Downpipe-Back System Wins
- T409 Stainless Steel Construction – Corrosion-resistant and durable
- Mandrel-Bent Tubing – No crimps, no airflow loss
- Leak-Free Flanges – Upgraded clamps for a tighter seal
- Pre-Welded Hangers – Easier install and more secure under load
- No Sensor Bungs – Clean straight pipe for tuned setups
The LB7 LBZ Duramax Downpipe-Back Exhaust is built for trucks that work hard and don’t settle for factory flow.
Performance You Can Feel
- Lower exhaust gas temperatures (EGTs)
- Deeper, smoother tone (with proper tuning)
- Increased responsiveness under throttle
- Built to handle power mods and long-term use
Pair this downpipe-back exhaust with proper race tuning, and your 6.6L Duramax gets the system it should’ve had from day one.
Fitment: LB7, LLY, and LBZ Duramax (2001–2007)
Fits:
2001–2007 Silverado/Sierra 2500HD & 3500HD with 6.6L Duramax LB7, LLY, or LBZ
Supports: EC/CC – SB, LB, Dually
Not for Cab & Chassis configurations
What’s Included
- Full LB7 LBZ Downpipe-Back Exhaust System
- All clamps, flanges, and welded hangers included
- Single side exit configuration
-
No bungs — built for custom, race-ready systems
Race-Only Use Notice
- This system is intended for off-road or competition use only. Requires aftermarket tuning. Installation on emissions-controlled vehicles may violate local laws. Check your region’s regulations before installing.
Why Dieselr?
- We’re not a call center pushing boxes. We’re the source.
- Trusted by the same brands you see every day
- Stocked across North America for faster delivery
- Backed by techs and tuners who actually know Duramax trucks
- When fitment, flow, and support matter — Dieselr delivers.
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