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Vehicle Info NeededFLOWMASTERPART NUMBER: 389-12599-FM
FlowMonster Straight-Through Muffler Oval Case Dual In/Dual Out: 3 in.
$10195
Ships on 09/16/2026
Lowest Price GuaranteeDual In/Dual Out
FlowMonster Straight-Through MufflerDual In/Dual Out: 3 in. Oval Case 409 Stainless Steel Natural Finish Sold Individually
Features:
- Universal oval case straight-through muffler
- 3 in. dual inlet/dual outlet
- Delivers a moderate, deep tone
- 3.500 in. perforated tubes with high-temperature sound absorption packing material
- 409 stainless steel construction delivers superior corrosion resistance
- Reversible internal design allowing flexibility of installation in either direction
- A moderate increase in interior tone over most OE-style mufflers
- Fully MIG-welded
- Clamp-on inlet/outlet connections
- Natural finish
- "FLOWMONSTER" logo embossed onto the muffler case
- Note:
- Not a direct-fit muffler, some adaption may be required for proper fitment.
Aggressive Sounding Mufflers!
Flowmaster FlowMonster Mufflers deliver an aggressive exhaust sound that speaks "POWER"! These compact mufflers have superior heat-absorption and corrosion-resistant materials that deliver lasting dependability and appearance. Fully MIG-welded construction provides dominant durability and excellent exhaust flow to get the most performance out of your car, truck or SUV.
Part TypeMuffler
Product LineFlowmaster FlowMonster Mufflers
BrandFLOWMASTER
Package Height9.0
Package Width12.3
Package Length28.4
Weight26.1 PG
Part CategoryPerformance Parts
Hardware IncludedNo
Outlet Diameter3 in (76.2 mm)
QuantitySold individually
Inlet LocationDual
Mounting Bracket IncludedNo
Case ShapeOval
Body Width11 in (279.4 mm)
Body Material409 Stainless Steel
Outlet LocationDual
Exit QuantityTwo
Inlet Diameter3 in (76.2 mm)
Clamps IncludedNo
Body Height5 in (127 mm)
Inlet Quantity2
Part FitmentUniversal
Muffler Body Length22 in.
FinishNatural
Package Qty1
Package TypeEA
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