SKU: 38999009448

Muffler 40" Series 2.5" Dual In/3" Center Out Aggressive Flowmaster

Sale price$91.76 Regular price$101.95
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Ships within 48 hours · Estimated delivery Jul 29 - Aug 3

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Description

Muffler 40" Series 2.5" Dual In/3" Center Out Aggressive FlowmasterOverview: 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. Features: No internal packing to blowout Excellent Street Strip and Off Road application Aggressive Sound Exterior Exhaust Tone Durable fully welded 16 gauge aluminized steel Specs: Body

Overview:

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.

Features:

  • No internal packing to blowout
  • Excellent Street/Strip and Off Road application
  • Aggressive Sound Exterior Exhaust Tone
  • Durable fully welded 16 gauge aluminized steel
  • Specs:

  • Body Height: 4
  • Body Length: 13
  • Body Material: Aluminized Steel
  • Body Width: 9.5
  • Brand: Flowmaster
  • Clamps Included: No
  • Color: Black
  • Emission Code: 5
  • Exhaust Tip Quantity: 0
  • Finish: High-Temperature Paint
  • Fitment: Universal
  • Grade Type: Performance
  • Hanger Included: No
  • Heat Shield Attached: No
  • Inlet Connection: Slip-Fit
  • Inlet Diameter: 2.5
  • Inlet Inside Diameter: 2.5
  • Inlet Location: Dual
  • Inlet Outside Diameter: 2.63
  • Inlet Quantity: 2
  • Inlet Type: Weld-On
  • Muffler Series: Original 40 Series
  • Muffler Type: Chambered
  • Outlet Connection: Slip-Fit
  • Outlet Inside Diameter: 3
  • Outlet Location: Center
  • Outlet Outside Diameter: 3.13
  • Outlet Quantity: 1
  • Outlet Type: Single
  • Overall Length: 19
  • Reversible: No
  • Shape: Oval
  • Sound Level: Aggressive
  • Tunable: No
  • Universal Or Specific Fit: Universal
  • Part Number: 425403
  • Emissions:

    • This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.
    Shipping Notes
    • Free Standard Shipping on $100+ Orders to the USA.
    • Except Preorder products are shipped in 48 hours.
    • Delivery to the USA:
    1. Standard Shipping : 3-10 business days
    • If time is of the essence, please consider selecting expedited delivery for faster service.
    Exchange/Return Notes
    • We offer a 30-day return/exchange service after receiving.
    • Final sale items are not eligible for returns or exchanges.
    • To process your return/exchange, please contact us at [email protected]
    • Please click here for more details>>> Return & Exchange Policy
    SKU: 38999009448

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    4.1 ★★★★★
    Based on 14 reviews
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    Verified Purchase
    Ernestina N Sarmiento
    Cuba, US
    ★★★★★ 5
    No la necesito
    Style Name: MacBook Neo 13" (A18 Pro), Configuration: Monthly
    Garantía digital , no la necesito no compré la laptop
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on March 26, 2026
    M
    Verified Purchase
    Martin Walyor
    New York, US
    ★★★★★ 5
    Fantastic product
    Size: 8 Fl Oz (Pack of 1)
    Works Great, at first didn't believe all the reviews, I've bought 5 chainsaws from one season to the next. After each winter couldn't get them to start. Followed the instructions to flush and let sit for a few days. Every one started and ran great. Hands down, this is a remarkable product for cleaning out blocked fuel systems from sitting all winter would recommend it for all 2 cycle engines and use the stable blend for winter as well as anytime use to prevent fuel spoilage.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on March 12, 2026
    W
    Verified Purchase
    Wayland Efird
    Lexington, US
    ★★★★★ 5
    Efird, a great product
    Size: 8 Fl Oz (Pack of 1)
    Used this in a Troy Built Garden Tiller, the tiller would stall and hard to crank until we use the Sta Bil Fast Fix, tiller now runs great and does not stall.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on April 25, 2026
    A
    Verified Purchase
    Amazon Customer
    Louisville, US
    ★★★★★ 5
    Worked great, saved me hundreds.
    Size: 8 Fl Oz (Pack of 1)
    I've had issues with the carburetor on my 2003 Honda ATV for years. It has needed cleaned regularly to stay running, and one repair shop wanted over $400 to replace the carburetor. One treatment with STA-BIL and it's running smooth again. Very impressive.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on May 21, 2026
    C
    Verified Purchase
    Chris Wildy
    Massapequa, US
    ★★★★★ 4
    Great for 2 cycle, meh for 4 cycle.
    Size: 8 Fl Oz (Pack of 1)
    This stuff is flat out amazing for 2 cycle small engines, works like advertised. 4 cycle isn't as good, if your engine hasn't ran in years, you'll still have to clean the carb, but it does help some. The 2 cycle oil for one is a lubricant and inhibits varnish buildup (especially a synthetic premium brand), and usually premium oil has a fuel stabilizer in it. Plus if you don't have a float bowl, there's not enough fuel for phase separation. I also use it in my mix for my ultrasonic cleaner when cleaning carbs. Overall a very good product, but understand it's limitations in this modern age of ethanal fuel.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on April 12, 2026

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