40 Delta Flow Muffler - 2.25 Offset In / 2.25 Center Out - Aggressive Sound
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Flowmaster Inc. 40 Delta Flow Muffler - 2.25 Offset In / 2.25 Center Out - Aggressive Sound

Part No. 942441 Warranty Details  

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This two chamber design incorporates Flowmaster's patented Delta Flow technology. The Delta deflectors generate increased scavenging for better performance and reduced interior sound. Milder exterior tone and reduced interior resonance over Original 40 series. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.
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Case Length:13 in
Case Shape:Flowmaster Case
Inlet Diameter:2.25 in
Inlet Location:Offset
Material:Aluminized Steel
Muffler Finish:Gray
Muffler Height:4 in
Muffler Material:Aluminized Steel
Muffler Shape:Flowmaster Case
Muffler Width:9.75 in
Outlet Diameter:2.25 in
Outlet Location:Center
Width:9.75 in


by PowerReviews
Flowmaster Inc.40 Delta Flow Muffler - 2.25 Offset In / 2.25 Center Out - Aggressive Sound

(based on 1 review)

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Reviewed by 1 customer

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Looks like a million bucks!


from Rockingham, NC

About Me Auto Enthusiast, Casual Driver

Verified Buyer


  • Adds Style
  • Easy Install
  • Easy To Install
  • Great Sound


    Best Uses

    • Everyday Driving
    • Performance Driving
    • Racing
    • Replacement

    Comments about Flowmaster Inc. 40 Delta Flow Muffler - 2.25 Offset In / 2.25 Center Out - Aggressive Sound:

    I installed this on my 1969 Mustang. The fit was perfect even though I went with an odd size (2 1/4), But that's exactly what I wanted. The build of this was very good, pretty welds, everything was top rate. I've not been for a test drive for sound yet, but it sounds really nice sitting in my garage. The last exhaust system I installed was a Bassani cat back and it's a great system, yet Its not a welded muffler, I'm thinking there is going to be a whole lot more life in these flowmasters! And the old school sound is allways a plus for an old school hotrod!

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    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.

    1 Question | 1 Answer
    Displaying question 1
    • Q:

      Does this muffler increase HP and gas mileage? I have a 95 Jeep Grand Cherokee V8 5.2L and am stuck between this one and the Flowmaster 10 S. Any suggestions on the best deep sounding muffler would be greatly appreciated. Thank you.
      Asked on 4/25/2011 by Mike

      1 answer



        Yes, it will increase the horse power and gas mileage for your vehicle. It should fit your vehicle. However, this product is universal and not a direct fit some modifications may be required for proper installation. These mufflers not only out-scavenge the originals, but also provide superior reductions in exterior sound levels and resonance, which are transmitted through the exhaust system and into the vehicle. You get all this, plus improved torque and horsepower and that famous Flowmaster sound.

        Answered on 4/26/2011 by DIY Daniel from AAP
    Displaying question 1

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