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Home > aFe Power > Exhausts > aFe Large Bore HD Exhaust

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aFe Large Bore HD Exhaust

  • All Turbo-Back Exhaust Systems are for OFF ROAD USE ONLY unless there are catalytic converter modifications to retain such parts for emission
  • All Hardware & brackets needed for OEM installation and installation instructions are included.
  • The 5" diameter Exhaust tips finishes up the entire system for a nice throaty sound and appearance enhancement. (Exhaust tips sold separately)
  • Choose from Aluminized Steel in Turbo Back, Cat Back or Tom Kit.
  • Large Bore Diesel Exhaust, Adds Up To 5 Horsepower, Increases Torque And Flow, Improves Fuel Economy, No Welding Required, 4" Mandrel Bent Tubing, Smooth Bends, Adjustable Hangers.
  • Our large 8" diameter straight flow through mufflers do a good job of letting the air out.
  • Exhaust tips not included with AFE large bore 4 inch exhaust systems
  • 1 Year Warranty on Stainless Exhaust
    2 Year Warranty on Aluminized Exhaust
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aFe large bore diesel exhaust systems for diesel trucks
AFE Large Bore Diesel Exhaust System on its own or in conjunction with an air intake or performance module, AFE's large bore exhaust is dyno proven to increase power and reduce EGT.

AFE Large Bore Diesel Exhaust System has mandral bends. Mandrel bends don't squash the tube like OE bends do. They are more painstaking to manufacture but worth it when you want the best for your truck.

AEM's seam welded louvered baffle muffler has no fiberglass to blow out. Its straight through design delivers a deep mellow sound that will bring new life to your truck.

Thoroughbred Diesel is a experienced diesel company that specializes in performance diesel exhaust systems. With top name brands such as MBRP, Magnaflow, and Diamond Eye we have the exhaust system for your Dodge Cummins, Ford Powerstroke, or GM Duramax diesel ready to ship at everyday low prices. Learn more about the new aFe exhaust systems below, they are priced right and in stock ready to ship.

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AFE Exhaust Systems are designed to replace the original equipment unit on your Diesel Truck. The AFE Large Bore 4 inch HD Diesel Exhaust System adds up to 5 horsepower, increases torque and flow, improves your fuel economy, no welding required, 4" mandrel bent tubing, smooth bends, and adjustable hangers. Choose from aluminized steel in turbo back, cat back or tom kit. aFe air intake systems and filters are very good at getting air to your engine faster and more efficiently. However, aFe realized that it is important to get the air out as well. Just like anything else, the more you ingest, the more you need to expel, otherwise things can get clogged up. That is the reason why we offer exhaust systems to go along with our air intake systems. It is a natural extension of our efforts to enhance more info ...the science of airflow management in performance vehicles. This is especially true in the diesel motor which is simply a huge air pump. Since diesel engines are a compression ignition engine and modern diesel-powered vehicles are turbo charged, the more air you pump in, the more power you generate. However, which turbo charged diesel, it is very important to get the hot exhaust out or the Exhaust Gas Temperature (EGT) rise to critical level that could damage the turbo itself. Most OE manufacturers offer a restrictive 3 1/2" exhaust system which is fine for normal every day city or highway driving. But you bought a diesel truck for its towing or work capabilities, didn't you? If so, you want more power to go up that grade towing your boat, trailer or tools. Getting the air in will give you more power. Getting the air out will give you more power. When you get more air in and out at the same time, you get a lot more power. With the 4" exhaust systems are mandrel bent aluminized steel which eliminates the sharp bends and kinks that the factory stock exhaust systems have. The aluminized steel resists corrosion as well as stainless steel but is priced more economically. Our large 8" diameter straight flow through mufflers do a good job of letting the air out as well. You do have the option of turning the muffler around for better flow or quieter ride. The 5" diameter Exhaust tips finishes up the entire system for a nice throaty sound and appearance enhancement. aFe entire systems comes with adjustable clamps, muffler and sectional tubing for easy installation whether you have a standard, extended or crew cab vehicle. (Exhaust tips sold separately). The kits includes Turbo-Back, Cat-Back or Tom-Kit with Muffler Delete Pipe (as specified), All Hardware & brackets needed for OEM installation and installation instructions.
Thoroughbred Diesel logo glowing Thoroughbred Diesel Performance and Repair Shop
4843 Rockwell rd.
Winchester, KY 40391
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