aFe® 49-12001 - Large Bore HD™ 409 SS Turbo-Back Exhaust System

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aFe Accessories

Large Bore HD™ 409 SS Turbo-Back Exhaust System (49-12001) by aFe®. Exhaust Type: Turbo-Back. Exhaust Tubing Material: 409 SS. Main Tubing Diameter: 4". System Sound: Aggressive. Get increased exhaust flow, more horsepower and torque, improved performance and lower exhaust gas temperatures with the aFe Large Bore HD Turbo Back Exhaust System. aFe dyno tests every system for maximum gains, and constructs them from mandrel-bent stainless steel for maximum flow and long-lasting durability.

Notes: For Race Use Only.

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Exhaust Type: Turbo-Back
Exhaust Tubing Material: 409 SS
Exit Location: Single Side
Main Tubing Diameter: 4"
System Sound: Aggressive
Muffler Body Length: 24"
Uses factory mounting locations
Flow Increase: +29%
Horse Power Increase: +15 HP
Torque Gain: +31 Lbs. x Ft.
Includes: OE style flange and band clamps, OE style bayonet hangers


  • Up to 29% greater exhaust flow than stock system
  • Increases horsepower and torque
  • Improves performance
  • Lowers exhaust gas temperature
  • Flow bench and dyno tested
  • Tubes mandrel-bent from 409 stainless steel
  • Welded hangers with swaged ends
  • Slotted and swedged ends
  • Premium quality band clamps
  • Backed by a 2-year limited warranty
  • Proudly made in the USA

A performance exhaust system is one of the most common ways of improving a vehicle's operation. The theory is simple; just reduce restriction to increase exhaust flow and you gain power. But all exhaust systems are not created equal; in reality there's more to it than just selling some sewer pipe sized tubes.

aFe tests its systems on the flow bench and the dynamometer to determine the right pipe size and muffler construction. Then they mandrel bend the pipes to ensure they maintain their shape and size throughout the entire length, to provide smooth, unrestricted airflow. Tubes that are not mandrel bent can lose up to 20% of their diameter in sharp bends. An 8" diameter by 30" length, straight, flow-through, perforated muffler is included in the system. A straight muffler delete pipe is also included if a more aggressive sound and maximum flow is desired. This system will increase exhaust flow by up to 29% and lower EGT (Exhaust Gas Temperature) by up to 100º, with a corresponding improvement in power and performance.

But performance is only part of the equation. A quality exhaust system should be easy to install and made to last. The muffler and all pipes of the Large Bore HD system are constructed from durable 409 stainless steel. To ensure a tight seal, slotted and swedged ends are used whenever possible. When used with the supplied premium quality band clamps, the tightest, leak-free seal is the result. Every hanger is thoroughly welded on each side to ensure a strong attachment and the hangers also feature swaged bayonet ends to lock in place once installed. The factory mounting locations are used throughout and a 2-piece tailpipe facilitates adjustment.

Every system comes with clamps, hangers and detailed instructions to guide you through the installation. The Large Bore HD Exhaust System is made in USA.

aFe® (Advanced Flow Engineering, Inc.) manufactures performance products for late model cars, light trucks and SUVs. The company was founded in 1999 with an initial concentration on high performance air filters. Since then, the company product line has broadened to include cold air intakes, fluid filters, exhaust systems, intake manifolds, intercoolers, programmers, differential covers, transmission pans and throttle body spacers. The team of engineers, machinists, production and sales people at aFe® have many years of experience in their respective positions, and together work to ensure they produce the best automotive products on the market.

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Warranty Information

aFe warrants their products to be free from manufacturer's defects due to workmanship and material. This warranty applies only to the original purchaser of the product and is non-transferable. Proof of purchase of the aFe product is required for all warranty claims. Warranty is valid provided aFe instructions for installation and/or cleaning were properly followed. Proper maintenance with regular inspections of product is required to insure warranty coverage. Damage due to improper installation, abuse, unauthorized repair or alteration is not warranted. Incidental or consequential damages or cost, including installation and removal of part, incurred due to failure of aFe product is not covered under this warranty. All warranty is limited to the repair and/or replacement of the aFe part.

aFe OE replacement filters are warranted against manufacturer defects for as long as you own the vehicle and it is properly maintained using our filter cleaning kit.

  • aFe universal clamp on air filters and air intake kits are warranted against manufacturer defects for 2 years
  • aFe racing filters are warranted against manufacturer defects for 1 year
  • aFe Electronics (Tuners/Modules) are warranted against manufacture defects for 2 years. If the item has been opened, aFe will offer an exchange for the same product only
  • All warranty is contingent on proper installation and proper maintenance using our restore kit
  • All other aFe products such as exhaust systems, intake manifolds, turbo chargers and intercoolers have a 2-year warranty
Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

Vehicle Fitment

2002 Dodge Ram
  • Base Club Cab / Quad Cab / Regular Cab Diesel
2001 Dodge Ram
  • Base Club Cab / Quad Cab / Regular Cab Diesel
2000 Dodge Ram
  • Base Club Cab / Quad Cab / Regular Cab Diesel
1999 Dodge Ram
  • Club Cab Diesel
1999 Dodge Ram
  • 2500 Base Regular Cab Diesel
1999 Dodge Ram
  • Base Quad Cab Diesel
1998 Dodge Ram
  • Base Club Cab / Quad Cab / Regular Cab Diesel
1997 Dodge Ram
  • Base Regular Cab Diesel
1997 Dodge Ram
  • 3500 Club Cab Diesel 155.0" Wheelbase
1997 Dodge Ram
  • Club Cab Diesel 134.7" Wheelbase / 135.0" Wheelbase / 138.7" Wheelbase / 139.0" Wheelbase / 154.7" Wheelbase / 163.0" Wheelbase
1996 Dodge Ram
  • Base Club Cab / Regular Cab Diesel
1995 Dodge Ram
  • Base Club Cab / Regular Cab Diesel
1994 Dodge Ram
  • Base Regular Cab Diesel

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