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aFe Power

Large Bore-HD 4-Inch Cat-Back Exhaust System

$825.00 $660.00 Save $165.00

SKU: 49-12002

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The aFe Power Large Bore-HD cat-back exhaust system is constructed from 409 stainless steel and features a 4-inch diameter pipe. It does not include a tip.
Show original supplier description
Constructed from durable 409 stainless steel, this system features a 4-inch diameter pipe designed to minimize restrictions and allow exhaust gases to flow more smoothly. The system is sold without a tip, offering flexibility for custom setups. This exhaust system is specifically designed for 2004.5-2007 Dodge Ram 2500 and 3500 models equipped with the 5.9L L6 Cummins Turbo Diesel engine. Its smooth curves and increased pipe size contribute to improved exhaust gas velocity and overall system efficiency. Installation involves ensuring proper alignment and maintaining safe clearance from all vehicle components, wires, and hoses. Installation instructions advise ensuring all components are properly aligned and kept at a safe clearance from wires, hoses, brake lines, body parts, and tires to prevent damage and ensure safe operation.
Vehicle Symptoms
  • High exhaust gas temperatures (EGT) under load
  • Reduced turbo spool and throttle response
  • Excessive backpressure causing poor fuel economy
  • Loud or droning exhaust note from stock system
  • Black smoke from overfueling due to restricted flow
Relevant Conversations
  • 2004.5-2007 Dodge Ram 5.9 Cummins high EGT fix
  • 4 inch cat-back exhaust vs 5 inch for Cummins
  • aFe 49-12002 cat-back exhaust review
  • Does cat-back exhaust lower EGT on 5.9 Cummins?
  • Dodge Ram 2500 5.9 Cummins turbo lag after exhaust upgrade
  • Best cat-back exhaust for 2006 Ram 3500 Cummins
  • aFe Large Bore HD exhaust install tips
  • Cummins cat-back exhaust vs downpipe and straight pipe
  • Can a cat-back exhaust fix black smoke on 5.9?
  • Dodge Ram 5.9 Cummins exhaust backpressure symptoms

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandaFe Power
Part Number49-12002
CategoryExhaust
5,000+ Trusted brands
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(760) 282-4645 hello@motormia.co

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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