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Exhaust› Mufflers and Resonators

Flowmaster

40 Series Chambered Muffler 40 Series 2.50 Inch In(D)/Out(D) Aggressive Sound Flowmaster

$114.95 $101.95 Save $13.00

SKU: F00L 425404

In Stock
In Stock
Ships by Aug 3
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Part #: 425404

The Original 40 series muffler delivers an aggressive exterior and interior tone. If you're looking for that original Flowmaster sound this is the muffler is for you.Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.No internal packing to blowoutExcellent Street/Strip and Off Road applicationAggressive Sound Exterior Exhaust ToneDurable fully welded 16 gauge aluminized steel

Features:

  • 409S Stainless Steel
  • No internal packing to blowout
  • Aggressive Exterior Exhaust Tone
  • Excellent Street/Strip and Off Road application
  • Aggressive And Powerful Exterior Exhaust Tone
  • Aggressive Sound Exterior Exhaust Tone
  • Notable Interior Resonance
  • Durable fully welded 16 gauge aluminized steel
  • Excellent Street/Strip And Off Road Application
  • No Internal Packing To Blowout
  • The Original Two Chamber Design
  • Premium Flowmaster Quality

40 Series (TM) Muffler | 2.5 in. Dual Inlet/Dual Outlet | Case Dimensions 13 in. Length/4 in. Thick | 19 in. Overall Length | W-9.75 in. | Aluminized Steel

MIA's Description

The Flowmaster 40 Series Oval Muffler is a chambered muffler designed for aggressive exhaust tones suitable for street, strip, and off-road use. It features dual 2.50-inch inlets and outlets for improved flow. This muffler is constructed from fully welded 16-gauge aluminized steel tubing with a matte black finish.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandFlowmaster
Part NumberF00L 425404

Buy with Confidence

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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