Product Description
MBRP S6005SLM is a 4" downpipe-back, no-muffler, single side exit system built in T409 stainless (Armor Plus) for 2001–2004 Chevy/GMC 2500/3500 6.6L Duramax (LB7). It’s designed for maximum flow, lower EGTs, and an aggressive tone, with mandrel bends and heavy-gauge construction to handle work trucks and tuned street rigs alike.
Fitment
- 2001–2004 Chevrolet Silverado 2500HD/3500HD 6.6L Duramax (LB7), EC/CC
- 2001–2004 GMC Sierra 2500HD/3500HD 6.6L Duramax (LB7), EC/CC
- Downpipe-back configuration; single passenger-side exit
- Note: Excludes certain California-emissions configurations for 2002–2004 (no cat-equipped/CA models). Verify before ordering.
Cross-Reference / MBRP Alternatives
- MBRP S6005P — 4" downpipe-back, single side exit, with muffler, Armor Lite (aluminized).
- MBRP S6005PLM — 4" downpipe-back, no muffler, Armor Lite (aluminized).
- MBRP S60210SLM — 5" downpipe-back, no muffler, T409 stainless.
- MBRP GMAL401 — 4" front pipe (Armor Lite) for 2001–2004 GM Duramax.
- MBRP GMS9401 — 4" front pipe with flange (Armor Plus T409) for 2001–2004 GM Duramax.
Specifications
| Brand / Series | MBRP — Armor Plus (T409 Stainless) |
| Part Number | S6005SLM |
| UPC | 882963131393 |
| Configuration | Downpipe-Back, Single Side Exit (Passenger) |
| Main Tubing | 4.0 in. mandrel-bent |
| Muffler | None (straight-through “LM” no-muffler) |
| Material / Finish | T409 Stainless / Natural |
| Tip Included | No |
| Warranty | 5-Year (manufacturer) |
| Vehicle | 2001–2004 Silverado/Sierra 2500/3500 6.6L Duramax (LB7) |
FAQ
Will this fit my 2001–2004 LB7 Duramax?
Yes — it’s built for 2500/3500 HD EC/CC LB7 trucks. Check for California-emissions exceptions on some 2002–2004 models before purchase.
What’s the difference between S6005P, S6005PLM, and S6005SLM?
S6005P includes a muffler (aluminized), S6005PLM deletes the muffler (aluminized), and S6005SLM deletes the muffler in T409 stainless for better corrosion resistance.
Is a tip included?
No tip is included in this kit. You can add an MBRP 4" tip separately.
Do I need tuning after install?
No tuning is required for the exhaust alone; pairing with other upgrades may benefit from calibration.
Is it street legal in California?
No — this downpipe-back, no-muffler system is not CARB approved and is not for sale/use on CA-emissions vehicles.
