Product Description
DIAMOND EYE 220099 is a 4.0" aluminized-steel turbo downpipe engineered for the first-gen 1989–1993 Dodge Ram 2500/3500 5.9L Cummins 2WD (2x4). Mandrel-bent tubing reduces backpressure and improves spool, throttle response, and overall exhaust flow in Diamond Eye’s Performance Series.
FAQ: WILL THIS FIT MY TRUCK?
Yes—if you have a 1989–1993 Dodge Ram 2500/3500 5.9L Cummins with 2WD (2x4). It fits all cab and bed lengths. This downpipe is for 2WD only; see the 4x4 downpipe alternatives in Cross-References below.
FAQ: WHAT MATERIAL IS IT?
Aluminized steel (Performance Series) for durability and value. Diamond Eye also offers stainless systems in this platform—see the turbo-back options below.
FAQ: DOES IT INCLUDE A BUNG OR HARDWARE?
Hardware is typically reused or supplied with the mating system. Oxygen-sensor bungs are not included on most first-gen downpipes—verify requirements for your setup.
Fitment Details
- Years: 1989, 1990, 1991, 1992, 1993
- Engine: 5.9L Cummins 12-Valve
- Chassis: Ram 2500/3500 2WD (2x4), all cab/bed lengths
- Tubing: 4.0" OD, mandrel-bent, aluminized steel
- Series: Diamond Eye Performance Series
Cross-Reference / Related Diamond Eye Items
- 2WD HX40-flange 4" downpipe: DIAMOND EYE 220104
- 4x4 3" downpipe: DIAMOND EYE 220100
- 4x4 4" downpipe: DIAMOND EYE 220105
- 2WD 4" stainless turbo-back system: DIAMOND EYE K4209S
- 4x4 4" stainless turbo-back system: DIAMOND EYE K4211S
Specifications
| Brand | Diamond Eye Performance |
|---|---|
| Part Number (MPN) | 220099 |
| UPC | 841963113365 |
| GTIN | 0841963113365 (GTIN-12 / UPC-A) |
| Material | Aluminized steel |
| Tubing Diameter | 4.0" OD |
| Vehicle Application | 1989–1993 Dodge Ram 2500/3500, 5.9L Cummins, 2WD (2x4) only |
| Series | Performance Series |
| Shipping Weight | Not listed by manufacturer |
| Package Dimensions | Approx. 9" x 9" x 37" |
| Shipping Method | Free Shipping (contiguous U.S.) |
| Prop 65 | WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
Notes: Off-road/competition use may be restricted by local emissions laws. Always verify your truck’s drivetrain (2WD vs 4WD) before ordering.
