Product Description
DIAMOND EYE K4124A is a 4" aluminized cat-back, dual (split rear/side) system with a louvered muffler for the 6.6L Duramax. It’s mandrel-bent for flow, tuned for a deep tone, and designed as a bolt-on upgrade.
Fitment Highlights
- Platform: Chevy Silverado / GMC Sierra 2500HD & 3500 (6.6L Duramax)
- Years: 2006 & early 2007 (Classic body, LBZ). Not for 2007.5–2010 LMM.
- Configuration: Fits all cab & bed lengths (LBZ Classic), dual split rear/side exit, includes muffler.
Why It Works
- 4" mandrel bends reduce backpressure and help lower EGTs
- Louvered muffler balances drone control with flow
- Aluminized steel for value and durability in harsh climates
FAQs
WILL THIS FIT MY 2007?
If your truck is an early 2007 “Classic” LBZ, yes. If it’s a 2007.5 LMM, choose an LMM-specific system instead (see MBRP alternative below).
IS THIS A CAT-BACK OR DPF-BACK?
It’s a cat-back for 2006/early-2007 LBZ (pre-DPF). 2007.5+ LMM trucks use DPF-back systems.
DOES IT COME WITH A MUFFLER?
Yes. This K4124A includes a louvered muffler. If you want a straight-pipe sound, Diamond Eye offers K4124A-RP (replacement pipe, no muffler).
Cross-Reference / Alternatives (MBRP-only)
- MBRP GMCA424 3" Turbo Downpipe — 2004.5–2010 LLY/LBZ/LMM (pairs well for added flow)
- MBRP S6026AL 4" DPF-Back — 2007.5–2010 LMM (use this if your truck is 2007.5+)
- MBRP GP010 4" Tail Pipe — 2001–2007 Classic (service/repair alternative)
Specifications
| Brand | Diamond Eye Performance |
|---|---|
| Part Number (MPN) | K4124A |
| UPC | 841963101591 |
| GTIN | 0841963101591 (UPC-A padded) |
| Material | Aluminized steel |
| Tubing Diameter | 4.0" |
| System Type | Cat-back, dual split rear/side, includes louvered muffler |
| Vehicle Fit | 2006 & early 2007 Chevy/GMC 2500/3500 6.6L Duramax (LBZ Classic), all cabs/beds |
| Shipping Info | Ships ground in oversize carton; approx. carton size 52" x 21" x 13" |
| Prop 65 | WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
Notes: For straight-pipe sound on LBZ Classic, see K4124A-RP (no muffler). For LMM (2007.5–2010), use an LMM-specific DPF-back like MBRP S6026AL.
