Product Description
DIAMOND EYE 400405 is a universal 4.0" aluminized steel quiet-tone resonator designed to knock down drone and harshness in performance diesel and gas exhaust systems while preserving flow. Includes inlet/outlet ends for easy clamp-in installation.
FAQ: WILL THIS FIT MY TRUCK?
This is a universal 4.0" single-in/single-out resonator. If your system uses 4.0" tubing, you can add it to many Cummins, Duramax, and Power Stroke builds. Measure your tubing and available space before ordering.
FAQ: DOES IT REPLACE MY MUFFLER?
It can supplement or replace a muffler to reduce drone. For maximum quieting with minimal restriction, pair it with a Diamond Eye 4.0" muffler.
FAQ: WELD OR CLAMP?
Either works. The included straight ends make clamp-in installs easy; welding provides a permanent, leak-proof joint.
Fitment Details
- Type: Universal resonator, single in / single out
- Tubing size: 4.0" (101.6 mm)
- Use cases: Drone reduction and tone refinement on performance diesel/gas 4.0" systems
Cross-Reference / Complementary Diamond Eye Parts
- Diamond Eye 460002 — 4" Aluminized Louvered Muffler (26")
- Diamond Eye 529020 — 4" Aluminized 90° Elbow
- Diamond Eye 400024 — 4" x 24" Aluminized Straight Pipe
Specifications
| Brand | Diamond Eye Performance |
|---|---|
| Part Number (MPN) | 400405 |
| UPC | 841963116564 |
| GTIN | 00841963116564 |
| Construction | Aluminized steel resonator with straight ends (clamp-ready) |
| Configuration | 4.0" single-in / single-out, quiet-tone internal design |
| Shipping Weight | ~11.8 lb |
| Package Dimensions | 23.8" x 5.0" x 5.0" (approx.) |
| Shipping | Free shipping from CPP Diesel (continental U.S.) |
| Prop 65 | WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
