Flowmaster 40 Series Delta Flow Muffler - 2-1/4" Center Inlet / Center Outlet
SKU: 87830390580

Flowmaster 40 Series Delta Flow Muffler - 2-1/4" Center Inlet / Center Outlet

Sale price$148.05 Regular price$164.50
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Ships within 48 hours · Estimated delivery Jul 7 - Jul 12

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Description

Flowmaster 40 Series Delta Flow Muffler - 2-1/4" Center Inlet / Center Outlet3 4 Day Lead time 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. Muffler Features: Body Height: 4. 00" Body Length: 13. 00" Body Width: 9. 75" Material:

3-4 Day Lead time

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.

Muffler Features:

Body Height: 4.00"

Body Length: 13.00"

Body Width: 9.75"

Material: Aluminized Steel

Sound Level: Aggressive Sound

 

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: 87830390580

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4.6 ★★★★★
Based on 506 reviews
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EverydayConsumerEddy
Chelsea, US
★★★★★ 5
Solid quality and good price
Size: 10 sqft
I bought this for my custom built camper van and it’s been great so far. For $24, the amount of coverage you get is totally fair, and I’ll probably grab a second box to finish everything. It’s easy to install with just scissors and something to press it down, and making quick cardboard templates really helps for tight spots. The adhesive is insanely strong, so once it sticks, it’s not going anywhere (just don’t let it stick to itself). Keep in mind this is sound deadening, not full soundproofing, but even with partial coverage I can already hear a difference in reduced road noise and vibrations. I’m using this as a base layer and plan to add soundproofing on top, and so far I’m really happy with how it’s turning out.
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Reviewed in the United States on January 22, 2026
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Verified Purchase
Dorthy Shortz
Houston, US
★★★★★ 5
It's a job but totally worth it
Size: 36 sqft
Pack a lunch when you tackle this project boys.. its a doozy!! Month in going great so far definetly did what I purchased it to do. 2000 chevy with two p3 10s every bass drop sounded like an old firebird with loose trunk bolts. Threw this on the back walls floor underneath the speaker and the doors.. all that energy is now in the cab with me instead of getting lost in rattling metal!! Love it!!! Left a few pieces outside after I was done rained like hell on them so water doesnt hurt this stuff at all or direct sunlight in south mississippi.. good stuff pick this up and make them systems thud instead of rattle!!! You wont regret it!! I didn't!!
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Reviewed in the United States on June 11, 2026
R
Verified Purchase
Roseanna Boyce
Whiting, US
★★★★★ 5
Delivers a quieter ride
Size: 36 sqft
This works very well to put down road noise. The difference was immediate in my van. I was shocked it made such a difference.
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Reviewed in the United States on June 6, 2026
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Verified Purchase
JC
Bozeman, US
★★★★★ 4
Reasonably priced sound deadening
Size: 18 sqft
Easy to cut with a carpet knife. I used a heatgun to make it stickier and more moldable. The foil isn't so thick that you risk cutting yourself like some Dynamat variants.
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Reviewed in the United States on March 12, 2026
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Verified Purchase
David
Carnegie, US
★★★★★ 5
Works for me
Size: 36 sqft
Sticky so don’t let it touch you or each other but it comes off and works fine.
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Reviewed in the United States on June 7, 2026

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