Product Description
DIAMOND EYE K4257A is a 4" aluminized steel DPF-back, single-side-exit exhaust system engineered for reduced backpressure and durable, bolt-on performance behind the factory emissions equipment.
Fitment: 2013–2015 Ram 2500 6.7L Cummins Long Box (LB) only. Does not fit Crew Cab Short Box or Mega Cab Short Box. Verify bed length before ordering.
Why it works: Mandrel-bent 4" tubing and high-flow routing lower post-DPF restriction, helping exhaust temps and throttle response without requiring any tuning.
Cross-Reference / Alternatives (MBRP on CPP Diesel)
- MBRP 5" Armor Lite DPF-Back Single (2013–2024 Ram 6.7L) — S61640AL
- MBRP 4" Installer Series Cool Duals DPF-Back (13–18/24 Ram 6.7L, select configs) — S6168AL
Specifications
| Brand | Diamond Eye Performance |
|---|---|
| MPN | K4257A |
| UPC | 841963105391 |
| GTIN | 0841963105391 (UPC-A) |
| System Type | DPF-Back, Single Side Exit |
| Tubing Diameter | 4.0" |
| Material | Aluminized Steel |
| Vehicle Fitment | 2013–2015 Ram 2500 6.7L Cummins, Long Box only |
| Shipping Info | Oversize boxed kit; ships ground. Typical carton approx. 52" x 21" x 13". |
| Includes | Tailpipes, clamps/hangers (per kit), hardware/instructions. |
| Prop 65 | WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov |
| CARB | Not CARB exempt; not for sale/use in California. |
FAQs
WILL THIS FIT MY 2014 RAM 2500 6.7L?
Yes, if your truck is a Long Box (LB). This kit does not fit Crew Cab Short Box or Mega Cab Short Box configurations.
DO I NEED TUNING OR TO DELETE EMISSIONS?
No. This is a DPF-back (a.k.a. filter-back) system. It installs after the emissions equipment and requires no tuning.
IS THERE A STAINLESS OPTION?
Diamond Eye offers stainless on many systems; if you prefer stainless or a 5" system, consider the MBRP alternatives linked above.
WHAT TIP IS INCLUDED?
Tip inclusion varies by kit and retailer; verify the contents before purchase. The system routes to a single side exit.
WHAT IF I HAVE A SHORT BOX?
Use a short-bed-specific kit. See the linked MBRP systems on this page for popular short-bed fitments.
