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Vehicle Info NeededFLOWMASTERPART NUMBER: 389-52571
70 Series Big Block II Muffler Offset In/Center Out: 2.5"
$24995
Ships on Nov 02, 2026
Lowest Price GuaranteeOffset In/Center Out
- 70 Series Big Block II Muffler
- Offset In/Center Out: 2.5"
- Aluminized Steel
- Durable Fully Welded 16ga Aluminized Steel
- 3 Year Limited Warranty
- Stock to Mild Exterior Exhaust Tone
- Minimal Interior Resonance
- Recommended For SUV/Trucks/Motorhomes/Tow Vehicles
- Improved HP/TQ and Potential Mileage Improvement
- Race Proven Patented Delta Flow Technology
- www.Flowmastermufflers.com
Quiet Operation, Maximum Efficiency
Flowmaster's 70 Series Big Block II Mufflers feature a longer case for increased volume and added sound reduction by utilizing Flowmaster’s patented Delta Flow Technology. The 70 Series offers maximum efficiency and minimum interior resonance, best suited for street cars, trucks, SUV’s, RVs and tow vehicles that require quiet operation with minimum improved sound. These mufflers will still fit many applications where the wider 50 Series Big Block muffler won’t.
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Features:- Mild - stock exterior tone.
- Best suited for quiet operation vehicles.
- 3-chamber, Delta Flow Technology.
- Constructed of 16-gauge aluminized steel.
- Fully MIG-welded.
Part TypeMuffler
Product LineFlowmaster 70 Series Big Block II Mufflers
BrandFLOWMASTER
Package Height5.6
Package Width10.7
Package Length28.9
Weight20.82 PG
Outlet Quantity1
Inlet PositionOffset
Inlet TypeWeld-On
Inlet Size (In.)2.5
Heat Shield AttachedNo
Body Length22 in.
Muffler Count1
Inlet Outside Diameter2.63 in.
Inlet Quantity1
Sound LevelMild
Outlet Outside Diameter2.63 in.
Muffler MaterialSteel
Universal Or Specific FitUniversal
Hanger IncludedNo
Inlet Connection TypePipe Connection
Outlet Diameter2.5 in (63.5 mm)
ColorBlack
TunableNo
Case Length22 in (558.8 mm)
Case ShapeOval
Body Width10 in.
Outlet Inside Diameter2.50 in.
Body Height5 in.
Outlet TypeSingle
Outlet PositionCenter
Part CategoryPerformance Parts
ShapeOval
Exhaust Tip Quantity0
Inlet LocationOffset
Muffler TypeChambered
Outlet StyleStandard, without tip
Muffler FinishAluminized
Mount TypeUses New Hangers (Not Included)
Inlet Diameter2.50 in.
Clamps IncludedNo
FinishHigh-Temperature Paint
ReversibleNo
Outlet Size2.5 in (63.5 mm)
Muffler Series70 Series Big Block
QuantitySold individually
Overall Length28 in.
MaterialAluminized Steel
Internal ConstructionChambered
Body MaterialAluminized Steel
Inlet Inside Diameter2.50 in.
Outlet LocationCenter
FitmentUniversal
Part FitmentUniversal
Vendor Part Number52571
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
