Product Description
DIAMOND EYE K4321S-RP is a 4.0" T409 stainless turbo-back exhaust system for the 2000–2003.5 Ford F-250/F-350 7.3L Powerstroke. This kit is the no-muffler (muffler delete) configuration with a single 4" inlet from the turbo and dual split rear/side exits for an aggressive tone and maximum flow.
Engineered for durability and easy bolt-on installation, the system uses mandrel-bent tubing, OEM-style hangers, and is designed for automatic-transmission, non-catalyst models. T409 stainless resists corrosion while keeping weight in check for long service life.
FAQ: WILL THIS FIT MY TRUCK?
Fits 2000–early 2003 (2003.5) Ford F-250/F-350 7.3L Powerstroke, all cab and bed lengths, equipped with an automatic transmission and built without a catalytic converter. If your 2003 is a late-03 6.0L or has different emissions/drive configuration, this kit will not apply. Always confirm your VIN year/engine build and transmission.
FAQ: WHAT DOES “RP” MEAN?
“-RP” designates the muffler-delete version which includes a replacement pipe. If you want the same kit with a muffler, see our stainless K4321S listing.
FAQ: IS IT CARB EXEMPT?
This system is designed for exempt/non-catalyst 7.3L applications (see installation notes). Verify local compliance before installation.
Fitment Details
- Platform: 2000–2003.5 Ford Super Duty F-250/F-350, 7.3L Powerstroke
- Configuration: Turbo-back, 4.0" single in / dual split rear & side out
- Material: T409 stainless steel
- Transmission: Automatic only
- Emissions: Non-catalyst models
Cross-Reference & Related
Specifications
| Brand | Diamond Eye Performance |
|---|---|
| MPN | K4321S-RP |
| UPC | 841963125177 |
| GTIN | 841963125177 (GTIN-12 / UPC-A) |
| System Type | Turbo-back, single in / dual split rear & side out |
| Tubing Diameter | 4.0" |
| Material | T409 stainless steel |
| Vehicle Fit | 2000–2003.5 Ford F-250 / F-350 7.3L Powerstroke, automatic, non-catalyst |
| Shipping | Qualifies for Free Shipping (truck freight may apply on some destinations) |
| Shipping Weight | ~99 lb (complete kit) |
| Package Dimensions | Approx. 52" x 21" x 13" |
| Prop 65 | WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
| Included | Muffler delete pipe, over-axle & tail sections, clamps/hardware, hangers |
Installation Tip: Reuse the OEM turbo V-band clamp; inspect and replace if worn. Penetrating lubricant helps during downpipe removal.
