DIAMOND EYE K4127A CAT BACK EXHAUST SYSTEM FOR 06-07 SILVERADO/SIERRA 2500/3500 4 INCH SINGLE SIDE WITH MUFFLER ALUMINIZED

DIAMOND EYE K4127A is a 4.0" aluminized cat-back exhaust for 2006–2007 Chevy/GMC 2500/3500 6.6L LBZ (all cab/bed). It delivers lower backpressure, deep tone, and durable mandrel-bent tubing for everyday towing and performance builds.

FAQ: WILL THIS FIT MY TRUCK?

Yes—fits 2006–2007 Silverado/Sierra 2500/3500 6.6L Duramax LBZ (classic body), all cab and bed lengths. Designed as a direct-fit cat-back system that retains emissions equipment.

FAQ: IS A TURBO DIRECT PIPE INCLUDED?

Per Diamond Eye’s listing for K4127A, a Turbo Direct Pipe #321056 is included in the kit. Always verify package contents at checkout.

FAQ: IS THIS SYSTEM C.A.R.B. EXEMPT?

Yes—listed as C.A.R.B. Exempt under Executive Order D-778. Check your local/state regulations.

Fitment Details

• Vehicle: 2006–2007 Chevy Silverado / GMC Sierra 2500HD/3500HD, 6.6L Duramax LBZ (classic body)
• Configuration: 4" cat-back, single passenger-side exit
• Includes: Muffler; hardware; Turbo Direct Pipe #321056 (per mfr)
• Material/Finish: Aluminized steel

Cross-Reference / Alternatives (MBRP-only, working CPP links)

• MBRP GP010 — 4" aluminized tail pipe for 2001–2007 GM classic-body (pairs with MBRP systems)
• MBRP GMS9423 — 4" T409 stainless regular-cab adaptor/front pipe for 2006–2007 classic-body
• MBRP S6000AL — 4" cat-back (01–05 LB7/LLY) as an earlier-gen alternative
• MBRP S6026AL — 4" filter-back (07.5–10 LMM) for next-gen trucks

Specifications