MBRP S6012409 4" CAT-BACK EXHAUST SINGLE SIDE T409 STAINLESS FOR 2006–2007 GM SILVERADO/SIERRA 2500/3500 6.6L DURAMAX

Upgrade your LBZ/late-LLY Duramax with the MBRP S6012409 4" T409 stainless cat-back, single-side exit. This Armor Plus (T409) system delivers a deeper tone, lower EGTs, and bolt-on durability for classic-body 2006–2007 Silverado/Sierra 2500/3500 HD trucks.

Fitment

• 2006–2007 Chevrolet Silverado 2500HD/3500HD, 6.6L Duramax (classic body), Extended Cab & Crew Cab
• 2006–2007 GMC Sierra 2500HD/3500HD, 6.6L Duramax (classic body), Extended Cab & Crew Cab
• Engine codes: LLY (late 2006) / LBZ

Highlights

• 4" mandrel-bent T409 stainless steel tubing
• Single-side exit with performance muffler
• Improved flow and sound with straightforward, clamp-on install
• Built for harsh climates — T409 steel resists corrosion better than aluminized

What’s Included

• Front/mid/over-axle/tail pipes (4")
• Performance muffler and tip (style may vary by batch)
• Clamps and required hardware
• Install instructions

Cross-Reference / Alternatives (MBRP-Only)

If your truck is a different year range or you prefer another material, consider these MBRP systems:

• 01–05 GM 6.6L (EC/CC) — MBRP S6000AL 4" Cat-Back, Aluminized
• 07.5–10 GM LMM — MBRP S6026P 4" Filter-Back, Aluminized
• 2020–24 GM L5P — MBRP S5093AL 4" Cat-Back, Aluminized

Helpful Notes

• Classic-body 2007 (“2007 Classic”) trucks apply; does not fit 2007.5+ new-body LMM models.
• No tuning required for cat-back installation.

FAQ

Yes — this system fits classic-body 2006–2007 Silverado/Sierra 2500/3500 HD with the 6.6L Duramax (Extended or Crew Cab).

T409 stainless steel (MBRP Armor Plus) for strong corrosion resistance at a great value.

No. As a cat-back system, it installs behind emissions equipment and does not require tuning.

For 2006–2007 classic-body, T409 is the common spec. If you’re on 01–05 or 07.5–10, see the MBRP alternatives listed above.

Looking for confirmation by VIN? Contact us — we’ll verify fitment for your specific truck.