Product Description
MBRP DAL405 is a 4-inch aluminized steel turbo down-pipe engineered for 2003–early 2004 Dodge Ram 2500/3500 5.9L Cummins (pre-2004.5 “Cummins 600”). Mandrel-bent tubing improves flow and helps lower EGTs compared to the restrictive stock down-pipe.
- Series: Armor Lite (Aluminized)
- Tubing Diameter: 4"
- Material: Aluminized steel
- UPC: 882963100504
- MBRP Part #: DAL405
Fitment
- 2003 Dodge Ram 2500/3500, 5.9L Cummins (HE341/HE351-style outlet), direct-fit down-pipe
- 2004 Dodge Ram 2500/3500, 5.9L Cummins early 2004 (305 HP)
Does not fit 2004.5–2007 5.9L “Cummins 600” (325 HP) trucks.
Cross-Reference / Alternatives (MBRP only)
- MBRP DS9405 – 4" Down Pipe, Armor Plus T409 stainless (03–04 5.9L)
- MBRP S6104AL – 4" Turbo-Back, Aluminized (03–04 5.9L, 305 HP)
- MBRP S6104409 – 4" Turbo-Back, T409 Stainless (03–04 5.9L, 4WD)
- MBRP S61140AL – 5" Turbo-Back, Aluminized (03–04 5.9L)
- MBRP S61140409 – 5" Turbo-Back, T409 Stainless (03–04 5.9L)
- MBRP S61140PLM – 5" Turbo-Back, PLM Series (03–04 5.9L)
Helpful Notes
- Verify your model year split: 03–early 04 only. Not for 04.5–07 “Cummins 600”.
- Reuses OE-style turbo outlet/V-band connection. Inspect clamp and gasket and replace if damaged.
FAQ
Will DAL405 fit my 2004 Cummins?
It fits early 2004 (305 HP) trucks. It will not fit 2004.5–2007 5.9L “Cummins 600” (325 HP).
What’s the difference between DAL405 and DS9405?
DAL405 is aluminized (Armor Lite). DS9405 is T409 stainless (Armor Plus) for enhanced corrosion resistance.
Do I need tuning with this down-pipe?
No tuning is required. This replaces the restrictive factory down-pipe to improve flow and may help reduce EGTs.
