Product Description
DIAMOND EYE 321045 is a 4" aluminized-steel, clamp-on adapter with a welded 4-bolt flange, built to connect your Duramax exhaust to the factory-style front/adapter plate for a leak-resistant, durable seal. Engineered for the 2001–2007.5 Chevy/GMC 2500/3500 6.6L Duramax (all cab/bed lengths) Performance Series systems.
Fitment Details
- Vehicle: 2001–2007.5 Chevrolet Silverado / GMC Sierra 2500 & 3500, 6.6L Duramax (LB7, LLY, LBZ)
- Connection: 4-bolt flange (one side) to 4.0" slip-fit (opposite side)
- Material/Series: Aluminized steel, Performance Series
- Configuration: Clamp-on adapter/transition, designed to mate to factory-style front flange
Cross-Reference / Related Diamond Eye Items (CPP Diesel)
- DIAMOND EYE 361045 — 4" T409 stainless version for the same 01–07.5 Duramax
- DIAMOND EYE 321052 — 4" second-section tail pipe, 01–07.5 Duramax
- DIAMOND EYE 321051 — 4" first-section tail pipe, 01–07.5 Duramax
FAQs
WILL THIS FIT MY 2001–2007.5 DURAMAX?
Yes — it’s designed for 01–07.5 Silverado/Sierra 2500/3500 6.6L Duramax (all cab/bed lengths) using Performance Series exhaust components. Always verify your front-flange style and pipe size.
WHAT SIZE IS THE SLIP CONNECTION?
The adapter uses a 4.0" inner-diameter slip-fit on the pipe side and a welded 4-bolt flange on the other side.
IS IT ALUMINIZED OR STAINLESS?
This part (321045) is aluminized steel. For stainless, see Diamond Eye 361045 linked above.
Specifications
| Brand | Diamond Eye Performance |
|---|---|
| Part Number (MPN) | 321045 |
| UPC | 841963115000 |
| GTIN | 0841963115000 (GTIN-12 / UPC-A) |
| Material | Aluminized Steel |
| Inlet/Outlet | 4-bolt welded flange → 4.0" slip-fit (clamp-on) |
| Vehicle Fit | 2001–2007.5 Silverado/Sierra 2500/3500 6.6L Duramax (LB7/LLY/LBZ) |
| Package Dimensions | 8" (W) × 8" (H) × 12" (D) |
| Shipping Method | Calculated at checkout (standard ground unless upgraded) |
| Prop 65 | WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
