Product Description
DIAMOND EYE K4110S-RP is a 4.0" T409 stainless cat-back single-side exit system for 2001–2005 Chevy/GMC 2500/3500 6.6L Duramax (LB7/LLY). It replaces the factory sections from the catalytic converter back and runs a no-muffler (straight-pipe) configuration for maximum flow, quicker turbo spool, and an aggressive tone—while reusing OEM hangers for a clean, bolt-on install.
Fitment Details
- Vehicle: 2001–2005 Chevrolet Silverado 2500HD/3500HD & GMC Sierra 2500HD/3500HD, 6.6L Duramax (LB7/LLY), all cab & bed lengths
- Configuration: 4" T409 stainless, cat-back, single side exit, no muffler
- Emissions note: Retains catalytic converter location; check local laws for sound/emissions requirements.
Cross-Reference / Alternatives (MBRP-only)
- MBRP S6000AL 4" Cat-Back (aluminized), 2001–2005 GM 6.6L Duramax — View on CPP Diesel
- MBRP GMAL413 Regular Cab Adaptor (pairs with S6000AL for RC/LB trucks) — View on CPP Diesel
What You’ll Notice
- Lower backpressure and EGTs from mandrel-bent 4" tubing
- Noticeably more turbo whistle and a deep, aggressive note (no muffler)
- Direct-fit install using factory hangers; no welding required in most cases
Specifications
| Brand | Diamond Eye Performance |
|---|---|
| MPN | K4110S-RP |
| Material | T409 Stainless Steel |
| Tubing Diameter | 4.0" |
| Exit | Single Side |
| UPC | 841963100815 |
| GTIN | 0841963100815 (UPC-A) |
| Shipping Weight | ~55 lb (boxed) |
| Package Dimensions | ~52" x 21" x 13" |
| Prop 65 | WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
| Country of Origin | USA (per distributor listings) |
FAQ: WILL THIS FIT MY CAB/BED?
Yes—this kit is designed for all cab and bed lengths for 2001–2005 LB7/LLY trucks. Regular Cab Long Box may require an adaptor on some MBRP alternatives; Diamond Eye K4110S-RP itself is built to span OE locations.
FAQ: HOW LOUD IS “NO MUFFLER”?
Expect a clearly more aggressive tone, especially under throttle. Cruise drone is minimal on many builds, but sound is subjective. If you want a quieter option, consider a similar cat-back with a muffler.
FAQ: DO I NEED TUNING?
No tuning is required for this cat-back installation.
FAQ: STAINLESS VS. ALUMINIZED?
T409 stainless resists corrosion better than aluminized steel and holds up longer in harsh climates. Aluminized (e.g., MBRP Armor Lite) is a budget-friendlier alternative.
