Product Description
DIAMOND EYE K4257S is a 4.0" 409 stainless DPF-back, single-side-exit exhaust engineered to reduce post-DPF backpressure and sharpen throttle response while retaining factory emissions equipment. Mandrel-bent tubing and OE-style hangers deliver a clean, bolt-on install and durable tone.
FAQ: WILL THIS FIT MY TRUCK?
Per Diamond Eye, this system fits 2013–2015 Ram 2500 6.7L Cummins — Long Box (LB) only. It is not for Crew Cab Short Bed. Always confirm bed length and cab configuration before ordering.
FAQ: DOES THIS DELETE EMISSIONS?
No. This is a DPF-back system that installs after the factory diesel particulate filter. No tuning or emissions removal is required.
FAQ: WHAT MATERIAL IS IT?
Constructed from 409 stainless steel for corrosion resistance and long service life in harsh climates.
Fitment Details
- Vehicle: 2013–2015 Ram 2500 6.7L Cummins (Long Box only)
- Configuration: Single, passenger-side exit
- Connection: Bolts to outlet after the factory DPF
- Notes: Not for Crew Cab Short Bed; verify cab/bed combo before purchase
Cross-Reference / Alternatives (Diamond Eye on CPP Diesel)
- K4257A — 4" DPF-Back Single (Aluminized)
- K4258S — 4" DPF-Back Dual Split Rear (409 Stainless)
- K4259A — 4" DPF-Back Single (Crew Cab Short Box, Aluminized)
- K4260S — 4" DPF-Back Dual Split Rear (Crew Cab Short Box, 409 Stainless)
Specifications
| Brand | Diamond Eye Performance |
|---|---|
| MPN | K4257S |
| Material | 409 Stainless Steel |
| Tubing Diameter | 4.0" |
| Exit | Single, passenger-side |
| UPC | 0841963105414 |
| GTIN | 0841963105414 (UPC-A) |
| Shipping Weight | ~48 lb |
| Prop 65 | WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
