DIAMOND EYE K5123S CAT BACK EXHAUST SYSTEM FOR 06-07 SILVERADO/SIERRA 2500/3500 5 INCH SINGLE PASS WITH MUFFLER STAINLESS

DIAMOND EYE K5123S is a 5.0" 409 stainless steel cat-back exhaust for the 2006–2007 Chevy/GMC 2500/3500 6.6L LBZ Duramax (all cab & bed lengths). It exits single passenger side and includes a straight-through muffler for deep tone without excessive drone. This kit also includes the Diamond Eye Turbo Direct Pipe #321056 to reduce backpressure right off the turbo, improving flow and responsiveness.

Highlights: 5" mandrel-bent tubing, 409 stainless construction, single side exit, straight-through muffler, and included LBZ Turbo Direct Pipe.

Notes on legality: exhaust and downpipe modifications may be subject to local emissions regulations; always verify compliance for your use case.

FAQ: WILL THIS FIT MY TRUCK?

Yes, if you have a 2006–2007 Chevy Silverado or GMC Sierra 2500/3500 HD with the 6.6L LBZ Duramax (any cab/bed). This kit is designed specifically for those trucks and includes the correct Turbo Direct Pipe for LLY/LBZ/LMM families (LBZ in this application).

FAQ: WHAT’S INCLUDED?

5" 409 stainless mandrel-bent cat-back piping, straight-through muffler, hardware/hangers, and Turbo Direct Pipe #321056 with thermal wrap.

FAQ: SOUND LEVEL?

Deep, performance-oriented tone with the muffler installed; aggressive under throttle, controlled on the highway.

Fitment Details

• Make/Model: Chevrolet Silverado 2500HD/3500HD; GMC Sierra 2500HD/3500HD
• Engine: 6.6L Duramax LBZ
• Years: 2006–2007
• Configuration: All cab and bed lengths
• Exit: Single side (passenger)

Cross-Reference / Related Items

• K5123S-RP: Same system without muffler (stainless)
• K5123A: Aluminized-steel version with muffler
• 321056: 3" Turbo Direct Pipe (LLY/LBZ/LMM), included in this kit

Specifications