Exhaust› Mufflers and Resonators
Flowmaster
40 Series Chambered Muffler 40 Series 2.50 Dual In 3.00 Center Out Aggressive Sound Flowmaster
SKU: F00L 425403
Moderate — 2–4 hours
Description
Part #: 425403
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.Excellent Street/Strip and Off Road applicationNoticeable interior resonanceAggressive Sound Exterior Exhaust ToneDurable fully welded 16 gauge aluminized steel
Features:
- Durable Fully Welded 16 Gauge Aluminized Steel
- Excellent Street/Strip and Off Road application
- Aggressive Sound Exterior Exhaust Tone
- Noticeable interior resonance
- Noticeable Interior Resonance
- Aggressive Sound Exterior Exhaust Tone
- Excellent Street/Strip And Off Road Application
- Durable fully welded 16 gauge aluminized steel
40 Series (TM) Muffler | 2.5 in. Dual Inlet/Center Outlet | Case Dimensions 4 in. x 9.75 in. x 13 in. | 19 in. Overall Length | Aluminized Steel
MIA's Description
Fitment
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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
| Brand | Flowmaster |
| Part Number | F00L 425403 |
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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