DIESELR Downpipe Back Exhaust - Single (2001-2007 GM 2500/3500 6.6L Duramax LB7/LLY/LBZ)

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.