5" Turbo-Back for 2003 Dodge 5.9L Cummins DPF Delete Race Pipe | SPELAB

SPELAB high-performance 2003 5.9L Cummins Turbo-Back Exhaust eliminates restrictions, slashing EGTs while boosting turbo response and power. Mandrel-bent tubing ensures maximum flow for relentless acceleration and that signature Cummins growl.

Specification

Benefits

Expect to see a significant increase in fuel mileage. If your DPF is plugged up your probably averaging about 13-14 mpg. More or less depending on the severity of the restriction. After deleting the DPF/CAT expect to get a combined mileage of 18-19 mpg.

• It removes the need to service the DPF at regular intervals (cleaning, replacement)
• A DPF delete will remove the possibility of a DPF failure which could cause expensive diesel repairs
• Due to less exhaust backpressure, the DPF delete increases exhaust flow and therefore increases the performance of your motor!
• Paired with an ECU remap, the DPF delete is proven to increase power and torque for all vehicles
• You will get a FREE high-quality exhaust tip

Installation

Install takes about 1hr with basic hand tools done on the ground of your driveway or garage. Quicker if you have automotive style lift. Cutting may be be required to fit shorter wheelbase bed/cab configurations. Clamps, hangers and hardware are included. You may have to re-use some factory hardware.
Tuner Required: Removal of the DPF, CAT, SCR, and/or DOC involves removing and eliminating emission related sensors. A DPF delete capable tuner is required to prevent any check engine light or diagnostic trouble codes from setting.

• 2003 Dodge 5.9L Cummins Diesel

Q1. What’s the difference between 4" and 5" exhaust systems?

• 4" – Better for mild/moderate tunes, retains some backpressure for low-end torque.
• 5" – Best for high-horsepower builds, maximizes flow for reduced EGTs and top-end power.

Q2. Will a magnet stick to this pipe? Is it really stainless steel?

Yes – This pipe uses T-409 stainless steel, which is still magnetic (unlike T-304). It offers excellent corrosion resistance while being more affordable than T-304.

Q3. Does this fit both short-bed and long-bed Crew Cab trucks?

• Yes – Fits all 2017-2025 L5P Duramax Crew Cab configurations (short bed & long bed).
• Does NOT fit Cab & Chassis models.

Q4. How thick is the pipe? Will it last?

2mm thick T-409 stainless steel – Durable enough for long-term use without excessive weight.

Q5. Will this improve performance?

• Yes! Benefits include:
• Lower EGTs (Exhaust Gas Temperatures)
• Faster turbo spool
• Better fuel efficiency (with proper tuning)
• No more DPF clogging issues

Q6. Is this street legal?

⚠ Off-Road Use Only – DPF removal is illegal for on-road vehicles in most regions. For competition/racing use only.