Product Description
DIAMOND EYE K4209A-RP is a 4.0" aluminized-steel turbo-back single-side exit exhaust system for first-gen 1989–1993 Dodge/Ram 2500/3500 5.9L Cummins 2WD (all cabs/beds). It replaces the factory system from the turbo outlet back to improve flow, reduce EGTs, and sharpen throttle response.
This RP configuration uses a muffler replacement pipe (muffler delete) for maximum flow, classic diesel tone, and simple bolt-on installation using supplied clamps and hangers. Includes the turbo downpipe and all primary tubing for a complete turbo-back conversion.
Fitment Details
- Platform: 1989–1993 Dodge/Ram 2500 & 3500, 5.9L 12-Valve Cummins, 2WD only (all cab & bed lengths).
- System layout: 4.0" turbo-back, single side exit; aluminized steel tubing; bolt-on kit with clamps/hangers.
- Notes: If you prefer a muffled version, choose Diamond Eye K4209A/K4211A variants, or see MBRP alternatives below.
Cross-Reference / Alternatives (MBRP-only)
- MBRP S6148AL — 4" turbo-back, single side exit, 2WD, Armor Lite (aluminized).
- MBRP S6150AL — 4" turbo-back, single side exit, 4WD, Armor Lite (aluminized).
- MBRP S6150409 — 4" turbo-back, single side exit, 4WD, Armor Plus (T409 stainless).
- MBRP S6150PLM — 4" turbo-back, single side exit, 4WD, PLM (no muffler) aluminized.
Specifications
| Brand | Diamond Eye Performance |
|---|---|
| MPN | K4209A-RP |
| UPC | 0841963103076 |
| GTIN | 00841963103076 (UPC-A) |
| Main Tubing Diameter | 4.0" |
| Material | Aluminized steel |
| System Type | Turbo-back, single side exit, muffler delete |
| Vehicle Fit | 1989–1993 Dodge/Ram 2500/3500 5.9L Cummins, 2WD only, all cabs/beds |
| In the Box | Downpipe, intermediate pipes, tailpipe, clamps/hangers, hardware |
| Shipping Weight | ~82–83 lb |
| Package Dimensions | ~52" × 21" × 12–13" |
| Warranty | 1-Year (aluminized) |
| Prop 65 | WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
FAQ: Will this fit my 4WD?
No — this specific kit is engineered for 2WD first-gen trucks. For 4WD applications, see the MBRP alternatives linked above.
FAQ: Does the RP version include a muffler?
No. The RP stands for a muffler replacement pipe (delete). If you want a muffled Diamond Eye kit, choose a non-RP part number or add a 4" performance muffler from our catalog.
FAQ: What downpipe/turbo connection does it use?
It’s a complete 4" turbo-back system including the downpipe designed for the first-gen Cummins layout. Always verify turbo outlet and truck configuration during installation.
