Ultra-Flo X Mufflers
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Dynomax Ultra-Flo X Mufflers

Part No. 17553 Warranty Details  
Quantity  Add to Cart

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DynoMax Performance Exhaust is a leading performance exhaust brand built on over 25 years of market leadership. Each and every DynoMax product is backed by engineers who know what you want and expect out of a performance exhaust product... and who exceed your expectations every time.
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Inlet Configuration:Offset
Inlet Inside Diameter:2.500 in
Inlet Quantity:2
Internal Construction:Absorption
Outlet Configuration:Offset
Outlet Inside Diameter:2.500 in
Outlet Quantity:2
Outlet Type:Pipe Connection
Overall Length:25.000 in
Shell Diameter Height:4.500 in
Shell Diameter Width:9.750 in
Shell Length:20.000 in
Shell Material:Stainless Steel
Shell Shape:Oval


by PowerReviews
DynomaxUltra-Flo X Mufflers

(based on 1 review)

Ratings Distribution

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  • 1 Stars



Reviewed by 1 customer

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(17 of 29 customers found this review helpful)


Awesome muffler!!! Great tone on my 5.4


from Anchorage, AK

Verified Buyer
Helpful Reviewer


  • Great Sound


    Best Uses

    • Performance Driving
    • Racing

    Comments about Dynomax Ultra-Flo X Mufflers:

    Put this on my 2nd gen Ford Lightning. This sounds great on my long tube headers, and 2.5" collector back system! I've had 3 different mufflers on the truck and this is by far the best sounding one. The internal design is great, removing the need for a pre-muffler x-pipe. Thoroughly impressed with this product [...]

    • Car & Truck:
    • Auto Enthusiast, Truck Enthusiast

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    Do you have questions about this product?


    Ask a question, get answers from real customers and in-house experts. For further assistance, please review your support options on our Contact Us page.

    3 Questions | 3 Answers
    Displaying questions 1-3
    • Q:

      Can this muffler be used transversly ?
      Asked on 9/10/2012 by fred from atlanta

      1 answer



        No, this part Dynomax Ultra-Flo X Mufflers, Part No. 17553 is not reversible.
        For compatibility of this part with your vehicle, please provide your vehicle make, model and engine specification.
        For any further assistance, please feel free to call us at 1-877-238-2623 or visit your nearest Advance Auto Parts store and our representatives would be more than happy to assist you.

        Answered on 9/11/2012 by Aaron from AAP
    • Q:

      i have a 05 chev avalanch with the 8.1 engine. will this muffler work and can u give me the case size and overal size. i need dual 3 in inlet and outlet.
      Asked on 3/23/2011 by Dave

      1 answer



        This part is universal and not a direct fit for your vehicle. This is a one size fits most.

        Answered on 3/24/2011 by Parts Guru Geo from AAP
    • Q:

      i wra hearing aids so i want the low sound of the duals will this muffler off me this sound with great prefromance
      Asked on 2/10/2011 by Anonymous

      1 answer



        No, they're packed with continuous roving fiberglass for a deep, powerful, true performance sound.

        Answered on 4/14/2011 by Parts Guru Geo from AAP
    Displaying questions 1-3

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