Muffler 40" Series 2.5" Dual In/3" Center Out Aggressive Flowmaster
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 7 - Jul 12

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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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    4.6 ★★★★★
    Based on 1369 reviews
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    Product Reviews
    A
    Verified Purchase
    Amazon Customer
    Bozeman, US
    ★★★★★ 5
    Inexpensive part and YouTube knowledge lead to quick fix
    Size: 96158T-1PCS
    Solenoid went out on boat. After viewing multiple videos on YouTube I figured that my solenoid was bad. Ordered this and received a day later. Replaced the other one and this worked perfectly.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on August 9, 2025
    I
    Verified Purchase
    Ivar Andreassen
    Natrona Heights, US
    ★★★★★ 5
    Worked perfectly!
    Size: 96158T-1PCS
    Have an older Mercury 40hp 2 stroke. This Solenoid worked perfectly. It is not that easy to install, due to the design of the engine. It does require a bit of patient and the right tools to do it. If you have big hands and don't do this type of repair to often, call a friend that is better than you to get some help :) I have an older engine but it runs like charm. I will order an extra Solenoid and place in the box of "important spare parts" for the future. Very good experience for the purchase and overall quality of the part.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on January 14, 2022
    M
    Verified Purchase
    me
    Dallas, US
    ★★★★★ 5
    Perfect fit and works great
    Size: 96158T-2PCS
    Perfect fit and works great. It is great that it comes as a 2pk. I replaced both with no need to change wiring, and kept the working one I had, as backup.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on May 27, 2026
    T
    Verified Purchase
    Tom K.
    Charlottesville, US
    ★★★★★ 4
    It works as it should...
    Size: 96158T-2PCS
    Used it in a pinch for stater relay... it works great. Be aware... Mine required metric sockets for the nuts... 10mm for large terminals - 3/8 was too tight and same for smaller terminals 7mm fit better than 5/16 that was too loose. The mounting holes are also spaced closer together than the OEM on a mercruiser 260 in a mid 1980's boat but easy to remedy with a 1/4" drill bit.
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on August 4, 2023
    D
    Verified Purchase
    Don
    Louisville, US
    ★★★★★ 5
    Fixed 4.3 Merc IO
    Size: 96158T-1PCS
    Engine wouldn't start reliably or consistently. I had no clicking either from the old solenoid even though it would start from time to time...motor starts perfect after install. Pretty easy install as long as you reconnect the right wires. This worked perfect!
    WAS THIS REVIEW HELPFUL?YesReportShare
    Reviewed in the United States on August 8, 2023

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