Flowmaster® - 70 Series Delta Flow™ Big Block Diesel Muffler

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Flowmaster® - 70 Series Delta Flow™ Diesel Big Block MufflerFlowmaster® - 70 Series Delta Flow™ Diesel Big Block MufflerFlowmaster® - 70 Series Delta Flow™ Diesel Big Block MufflerFlowmaster® - 70 Series Delta Flow™ Aluminized Steel Big Block Muffler - 3D ViewFlowmaster® - Offset Inlet / Offset Outlet MufflerFlowmaster® - 70 Series Delta Flow™ Diesel Big Block Muffler InformationFlowmaster® - 70 Series Delta Flow™ Diesel Big Block Muffler Mild SoundFlowmaster® - Super 50 and 70 Series Delta Flow™ Muffler Commercial 602x420Flowmaster Authorized Dealer
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1998 Ford F-150
Fits Following Model(s):
  • Base / Lariat / XL / XLT
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flowmaster exhaust system

Ford F-150 Base / Lariat / XL / XLT 1998-1999, 70 Series Delta Flow™ Aluminized Steel Big Block Diesel Muffler by Flowmaster®, MILD SOUND, 2.5" Offset Inlet / 2.5" Offset Outlet, 5" Thick x 10" Wide x 22" Case Length x 28" Overall Length. The 70 Series Big Block II Muffler uses a longer case for increased volume and added sound reduction that fits many applications that the wider 50 Series Big Block muffler won’t fit. It utilizes Flowmaster’s patented Delta Flow Technology for maximum efficiency and minimum interior resonance.

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  • Quiet Muffler for Trucks and Big Power Engines
  • Three-Chamber Delta Flow Technology
  • Fully MIG-Welded for Maximum Durability
  • Finely Tuned on Dynamometer
  • Race Proven Technology
  • Available in 16-Guage Aluminized Mild Steel and in Stainless Steel
  • 3-Year Warranty for Aluminized Mild Steel
  • Limited Lifetime Warranty for Stainless Steel
Flowmaster - Delta Flow Technology

The 70-Series was originally designed for trucks, giving them the powerful Flowmaster sound at low decibel and resonance levels. Despite being designed to be the quietest Flowmaster mufflers, they have been used in extreme racing applications where high horsepower engines demand a large sound cancellation chamber so as not to lose power or torque to meet noise regulations. The 70 Series mufflers are perfect for high performance street cars, most trucks, SUV’s, RVs and tow vehicles that require quiet operation with improved sound. These mufflers are constructed of 16-gauge aluminized steel and fully MIG-welded for maximum durability. 5" Thick x 10" Wide x 22" Long with inlet/outlet sizes from 2.25" up to 3".

All Flowmaster mufflers are tuned for maximum performance. All Flowmaster mufflers produce a beautiful deep performance tone. Choosing the right Flowmaster muffler is not a technical decision – it is all up to your personal taste. It’s A Sound Decision®.

Flowmaster mufflers differ in technology and tuning, and thus in tone and character, to give your performance engine a sound to your personal liking.

Flowmaster mufflers employ two unique technologies developed by the company; the patented Delta Flow and the Laminar Flow. They give different characters of sound and can be tuned to achieve the desired exhaust note. Flowmaster Exhaust System Technology is so versatile, and gives such a high degree of control, that it is used both by racers, who want maximum power, and by the U.S. Air Force in Stealth applications where maximum silence and minimum heat emissions are prime considerations. Be it for a domestic or import truck, SUV, off-road warrior, daily driver, muscle car, euro-spec cruiser or sport compact vehicle Flowmaster always has the right muffler for you.

Flowmaster® has its roots in solving the engine noise problems encountered by California racers in the 1980s. In 1983 Flowmaster’s founder, Ray Flugger, created his first patented design of racing silencers, which dampened noise with minimal loss of power. Ray attached handles to ease carrying the square shaped race mufflers through the race pits, and the mufflers became known as the "suitcase mufflers." Today, the innovative Flowmaster mufflers are the result of years of development with top race engine builders, thousands of hours of dyno research and "real-world" on-track testing.

Flowmaster® - 70 Series Delta Flow™ Diesel Big Block MufflerFlowmaster® - 70 Series Delta Flow™ Big Block...    $152.15
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