Stainless Universal Performance Muffler, Oval Case Shape, Inlet Diameter - 3.5 in.
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MagnaFlow Stainless Universal Performance Muffler, Oval Case Shape, Inlet Diameter - 3.5 in.

Part No. 12587 Warranty Details  

Fit of this part varies by vehicle & equipment specs Type of Fit

MagnaFlow Performance Exhaust has universal mufflers available for many applications in various sizes and configurations to fit your needs. Made of 100% stainless steel, these universal mufflers are a great addition since they not only improve your vehicle performance but also give it that show-stopping look.
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Case Length:22 in
Case Shape:Oval
Hanger Included:No
Inlet Diameter:3.5 in
Inlet Location:Centered
Inlet Quantity:1
Inlet Size(s):3.5 in
Internal Construction:Temperature Resistant Acoustical Packing Material
Material:Stainless Steel
Muffler Finish:Satin Finish
Muffler Height:6.25 in
Muffler Material:Stainless Steel
Muffler Overall Length:29.5 in
Muffler Shape:Oval
Muffler Shell Length:22 in
Muffler Width:11 in
OE Replacement:No
Outlet Diameter:2.5 in
Outlet Location:Dual Outlet
Outlet Quantity:2
Outlet Size(s):2.5 in
Outlet Type:Weld on
Overall Length:28 in
Quantity per Vehicle:Universal
Thickness:6.25 in
Width:11 in


by PowerReviews
MagnaFlowStainless Universal Performance Muffler, Oval Case Shape, Inlet Diameter - 3.5 in.

(based on 1 review)

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Reviewed by 1 customer

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(2 of 4 customers found this review helpful)


Great sound, very good build quality


from Waldport, OR

About Me Auto Enthusiast, Casual Driver, Mechanic, Truck Enthusiast


  • Adds Style
  • Bi-directional
  • Great Sound
  • Increases Power
  • Quiet
  • Stainless Steel


  • Heavy
  • Large

Best Uses

  • Everyday Driving
  • Performance Driving
  • Restoration

Comments about MagnaFlow Stainless Universal Performance Muffler, Oval Case Shape, Inlet Diameter - 3.5 in.:

This is a great quality muffler, it is made out of stainless steel and carries a lifetime warranty from Magnaflow. In addition Advance gives you a 90 day warranty.

I previously installed a Thrush 19654 in my 69 Ford pickup, it was loud and had terrible resonance. After installing one of these Magnaflow mufflers for a customer, I realized just how good they were, and after using a coupon code here at Advance I got it for what I'd paid for the Thrush!

Its got a nice deep quite tone that doesn't give me a headache when driving, I have it behind a 460 and for a steet machine it is perfect. If you've got a serious hp machine with a big block you might consider a larger muffler.

The only drawbacks to these mufflers is their size and weight, I barely had room to install this one they way I wanted to.

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