Product Description
DIAMOND EYE K4258A is a 4.0" aluminized-steel DPF-back exhaust system engineered for Ram 2500 6.7L applications that use the long-box / coil-spring layout. It replaces the factory post-DPF tubing with mandrel-bent 4" piping and a dual split-rear exit for a cleaner look and freer flow—no tuning required.
FAQ: WILL THIS FIT MY TRUCK?
This kit is specified by Diamond Eye for 2013–2015 Ram 2500 6.7L, Long Box only. Many retailers list fitment through 2018 on 2500 Long Box. It does not fit most 3500 (leaf-spring) layouts. Always verify cab/bed and rear-suspension style before purchase.
FAQ: DOES IT DELETE EMISSIONS OR NEED TUNING?
No. This is a DPF-back system. It installs after the emissions equipment and does not require tuning.
FAQ: SINGLE OR DUAL EXIT?
K4258A is a dual split-rear exit configuration in 4" aluminized steel. If you prefer stainless or a different cab/bed, see the Cross-Reference options below.
Fitment Details
- Platform: Ram 2500 6.7L Cummins (2013–2018 range commonly cited), Long Box only
- Rear Suspension: Coil-spring 2500 applications (not typical for 3500 leaf-spring)
- Configuration: 4" DPF-back, dual split-rear exit
- Notes: Verify wheelbase, cab/bed, and hanger locations before ordering
Cross-Reference / Alternatives
- Stainless version — Diamond Eye K4258S
- Alternate Diamond Eye 2014 2500 CC Short Box stainless dual — Diamond Eye K4260S
- 5" stainless DPF-back option (brand alternative) — aFe 49-42051-1B
Specifications
| Brand | Diamond Eye Performance |
|---|---|
| Part Number (MPN) | K4258A |
| UPC | 841963105438 |
| GTIN | 0841963105438 (UPC-A) |
| Material | Aluminized steel |
| Pipe Diameter | 4.0" |
| Exit | Dual split-rear |
| Emissions | DPF-back (no tuning required) |
| Shipping Dimensions | 52" x 21" x 13" |
| Shipping Method | Ground (oversize box) |
| Prop 65 | No listed Prop 65 warning per vendor (subject to change) |
| CARB Notice | Not CARB legal for sale in California (filter-back may still be restricted by local law) |
