Product Description
Overview
Unlock classic LB7 sound and flow with the MBRP S6005PLM 4" downpipe-back system. This Armor Lite (aluminized steel) kit deletes the muffler for maximum exhaust velocity, a deep, aggressive note, and simple bolt-on installation. Mandrel-bent tubing keeps bends smooth for lower backpressure and cooler EGTs.
Fitment
- 2001–2004 Chevrolet Silverado 2500/3500 6.6L Duramax (LB7) EC/CC
- 2001–2004 GMC Sierra 2500/3500 6.6L Duramax (LB7) EC/CC
- Note: Excludes 2002–2004 California emissions models.
Cross-Reference / Alternatives (MBRP only)
- 4" Aluminized (with muffler): MBRP S6005P
- 4" T409 Stainless (no muffler): MBRP S6005SLM
- 5" Aluminized (with muffler): MBRP S60210P
- 5" Aluminized (no muffler): MBRP S60210PLM
- 5" T409 Stainless (no muffler): MBRP S60210SLM
Recommended MBRP Pairings
- 3" Turbo Downpipe (LB7), CARB EO D-763-2: MBRP GMCA425
- 4" Front Pipe, Armor Lite: MBRP GMAL401
- 4" Front Pipe, Armor Plus (T409): MBRP GMS9401
Specifications
| Brand | MBRP |
| Part Number | S6005PLM |
| UPC | 882963131386 |
| Series / Material | Armor Lite — Aluminized Steel |
| Piping Diameter | 4.0 in (101.6 mm) |
| Configuration | Downpipe-Back, Single Side Exit |
| Muffler | None (muffler delete) |
| Bend Type | Mandrel |
| Emission Note | Excludes 2002–2004 California models |
| Warranty | 1 Year (Armor Lite) |
What You’ll Notice
- Lower backpressure and quicker turbo response from smooth mandrel bends
- Classic LB7 tone with an aggressive idle and pull (no muffler)
- Budget-friendly durability for dry climates (aluminized steel)
FAQ
Will S6005PLM fit my 2001–2004 LB7 extended or crew cab?
Yes. This kit is designed for 2001–2004 Silverado/Sierra 2500/3500 6.6L Duramax EC/CC (LB7). Verify bed length before installation.
Does this include a muffler?
No. PLM series uses a muffler delete for maximum flow and sound. If you want a muffler, choose S6005P.
Is aluminized steel right for me?
Aluminized (Armor Lite) is a great value and resists corrosion in dry climates. For harsher climates or road salt, consider T409 stainless (S6005SLM).
Do I need tuning?
No tuning is required for the exhaust alone. Always follow local emissions laws.
What other parts should I add?
A 3" turbo downpipe (GMCA425) and the correct 4" front pipe (GMAL401 or GMS9401) pair well to maximize flow and simplify install.
