DIAMOND EYE K4110A-RP EXHAUST SYSTEM 01–05 SILVERADO/SIERRA 2500/3500 6.6L DURAMAX 4" CAT-BACK WITHOUT MUFFLER ALUMINIZED

DIAMOND EYE K4110A-RP is a 4" aluminized cat-back exhaust system for 2001–2005 Chevy/GMC 2500/3500 6.6L Duramax. It replaces the muffler with a straight-through replacement pipe for maximum flow and a deep, authoritative tone. Mandrel-bent tubing helps lower backpressure and EGTs, while bolt-on design simplifies install.

FAQ: WILL THIS FIT MY TRUCK?

Yes—fits 2001–2005 Silverado/Sierra 2500/3500 6.6L Duramax (all cab & bed lengths). Works on LB7 (’01–’04) and LLY (’04.5–’05) platforms. Always verify local emissions rules before purchase.

FAQ: IS THIS A DOWNPIPE-BACK OR CAT-BACK?

This kit is cat-back. It connects after the catalytic converter (where equipped), replacing intermediate/muffler/tail sections.

FAQ: DOES IT INCLUDE A MUFFLER?

No. The -RP suffix denotes the muffler replacement pipe (no muffler) for maximum sound and flow.

FAQ: IS IT LEGAL IN CALIFORNIA?

Many retailers restrict shipment of this no-muffler configuration to California. Check local and state regulations before ordering.

Fitment Details

• Vehicle: 2001–2005 Chevrolet Silverado / GMC Sierra 2500 & 3500, 6.6L Duramax (LB7 & LLY)
• Configuration: 4" cat-back, single side exit, aluminized steel
• Muffler: Not included (replacement straight pipe)
• Tip: Not included (tips sold separately)

Cross-Reference / Alternatives (MBRP-only)

• MBRP S6005PLM — 4" downpipe-back, no muffler, aluminized, for 2001–2004 LB7.
• MBRP S6005P — 4" downpipe-back, with muffler, aluminized, for 2001–2004 LB7.
• MBRP S60210SLM — 5" downpipe-back, no muffler, T409 stainless, for 2001–2004 LB7.

Note: The MBRP items above are downpipe-back alternatives for 2001–2004 LB7; this Diamond Eye kit is a cat-back for 2001–2005.

Specifications