Product Description
DIAMOND EYE 261001 is a 4.0" T409 stainless turbo downpipe engineered to reduce backpressure and improve spool on 5.9L Cummins builds. It mates the stock turbo outlet to your exhaust for a durable, leak-resistant connection and long service life.
FAQ: WILL THIS WORK WITH MY TURBO?
Yes—this downpipe is designed to work with the stock turbo on applicable model years (see Fitment). If you have an aftermarket housing or swap, verify outlet size/orientation before ordering.
FAQ: WHAT GAINS SHOULD I EXPECT?
Reduced exhaust restriction typically improves throttle response and can support horsepower gains when paired with other upgrades. Results vary with tune and overall setup.
FAQ: STAINLESS OR ALUMINIZED?
This part is T409 stainless steel for excellent durability through heat cycles and winter use.
Fitment Details
- Vehicles: 1994–2002 Dodge Ram 2500/3500 5.9L Cummins*
- Configuration: 4.0" inlet / 4.0" outlet, works with stock turbo
- *Note: Diamond Eye catalogs this part for 1998.5–2002 24-valve direct fit. Earlier 12-valve trucks may require different hardware/parts.
Cross-Reference / Alternatives (Diamond Eye on CPP Diesel)
- K4212S – 4" Stainless Turbo-Back w/ Muffler (94–02 Cummins)
- K4212S-RP – 4" Stainless Turbo-Back No Muffler (94–02 Cummins)
- 221043 – Downpipe Set (98–02 24-valve Cummins)
- 220105 – 4" Downpipe (89–93 Cummins, for reference if swapping)
Specifications
| Brand | Diamond Eye Performance |
|---|---|
| Part Number (MPN) | 261001 |
| Material | T409 stainless steel |
| Inlet / Outlet | 4.0" / 4.0" |
| Finish | Natural |
| UPC | 841963114102 |
| GTIN | 0841963114102 (UPC-A) |
| Shipping | Free Shipping (CPP Diesel) |
| Package Dimensions | 13.00" (H) x 9.00" (W) x 53.00" (L) |
| Prop 65 | WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
