Product Description
DIAMOND EYE 529020 is a universal 4.0" mandrel-bent 90° L-bend elbow formed from aluminized steel. It’s ideal for custom downpipe/tailpipe routing, tight-clearance turns, and repair work on diesel or gas exhaust systems where durable weldability and smooth flow matter.
Fitment Details
- Type: Universal 4.0" fabrication component
- Bend: 90° L-bend, mandrel-bent for minimal restriction
- Material: Aluminized steel (approx. 16-gauge)
- Common Uses: Downpipe transitions, tailpipe direction changes, custom single/dual systems
Cross-Reference / Alternatives (Diamond Eye on cppdiesel.com)
- DIAMOND EYE 529005 — 3" 90° aluminized elbow
- DIAMOND EYE 529010 — 3.5" 90° aluminized elbow
- DIAMOND EYE 529021 — 4" 90° stainless elbow
- DIAMOND EYE 529025 — 5" 90° aluminized elbow
- DIAMOND EYE 529026 — 5" 90° stainless elbow
Specifications
| Brand | Diamond Eye Performance |
| MPN | 529020 |
| UPC | 841963118292 |
| GTIN | 0841963118292 |
| Tubing Diameter | 4.0" (universal fabrication) |
| Bend | 90° L-bend (mandrel) |
| Material | Aluminized steel |
| Shipping Dimensions | 9" W × 9" H × 26" L (package) |
| Shipping | Calculated at checkout |
| Prop 65 | WARNING: Cancer and Reproductive Harm — P65Warnings.ca.gov |
FAQ
Will this fit my truck?
This is a universal 4.0" fabrication elbow used across Ford, GM, Ram, and custom builds. Verify you need a 4.0" 90° elbow before ordering.
What are the end sizes?
Typical listings note a universal 4.0" configuration suitable for slip-fit and welding during fabrication.
Is this CARB/EPA approved?
Universal tubing is not an emissions device. Always follow local laws and shop shipping policies.
What material and bend process?
Aluminized steel with a mandrel bend for smooth flow and easy weldability.
What about shipping?
Shipping is calculated at checkout; package dimensions are listed above for estimator accuracy.
