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Flowmaster

Flowmaster 70 Series Big Block II Steel 2.5 Inch Muffler 52573 Muffler, Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

SKU: FLO52573

Mufflers
Flowmaster 70 Series Big Block II Steel 2.5 Inch Muffler 52573 Muffler, Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

Flowmaster

Flowmaster 70 Series Big Block II Steel 2.5 Inch Muffler 52573 Muffler, Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

SKU: FLO52573

Mufflers
A$860.91
IN STOCK! Est Ship 4-7 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.
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Description

These 70 Series Big Block II mufflers are designed around a large case for maximum volume and efficiency. They're 2 in. narrower than the original Big Block muffler, making them easier to install into tight areas. Other features include a mild, mellow exhaust tone and a resonant tuning chamber for reduced interior sound levels.

Part Type

70 Series Hi-Performance Muffler 2.50in Offset

Data: v4.2 - Upd: 2026-10-13 18:42:35

Specifications

Product Attributes - Brand
Flowmaster
Product Attributes - Manufacturer's Part Number
52573
Product Attributes - Part Type
Mufflers
Product Attributes - Product Line
Flowmaster 70 Series Big Block II Mufflers
Product Attributes - UPC
700042014446
Product Attributes - Muffler Material
Steel
Product Attributes - Inlet Diameter (in.)
2.50 in.
Product Attributes - Outlet Diameter (in.)
2.50 in.
Product Attributes - Inlet Quantity
1
Product Attributes - Outlet Quantity
1
Product Attributes - Electronic Valve
No
Product Attributes - Internal Construction
Chambered
Product Attributes - Inlet Location
Offset
Product Attributes - Outlet Location
Offset
Product Attributes - Case Shape
Oval
Product Attributes - Reversible
No
Product Attributes - Muffler Color
Black
Product Attributes - Case Exterior Length (in.)
22.00 in.
Product Attributes - Overall Length (in.)
28.00 in.
Product Attributes - Thickness (in.)
5.000
Product Attributes - Width (in.)
10.000 in.
Product Attributes - Outlet Style
Standard, without tip
Product Attributes - Remanufactured
No
Product Attributes - Quantity
Sold individually.

Reference Information

Brand Name/s Flowmaster
StreetFX SKU flo52573
SFX Item ID 4984257
Supplier Item Code 4984257
Manufacturer SKU 52573
Manufacturer UPC 700042014446
Alternative References FLM52573, Inlet/2

Compatibility

Application Data
  • UniversalYes
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1978
    CID292
    DrivetrainRWD
    Ending Year1978
    Engine FamilyCHEVROLET L6 GAS
    Engine Size4.8L/292
    Engine TypeL6
    Engine VIN CodeT
    Liter4.8
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1978
    CID305
    DrivetrainRWD
    Ending Year1978
    Engine FamilyChevy small block Gen I
    Engine Size5.0L/305
    Engine TypeV8
    Engine VIN CodeU
    Liter5.0
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1978
    CID454
    DrivetrainRWD
    Ending Year1978
    Engine FamilyChevy big block Mark IV
    Engine Size7.4L/454
    Engine TypeV8
    Engine VIN CodeS
    Liter7.4
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1978
    CID305
    DrivetrainRWD
    Ending Year1979
    Engine FamilyChevy small block Gen I
    Engine Size5.0L/305
    Engine TypeV8
    Engine VIN CodeU
    Liter5.0
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes70 Series™ Big Block II Muffler; 2.5 in. Offset Inlet/Opposite Side Offset Outlet; Case Dimensions 5 in. x 10 in. x 22 in.; 28 in. Overall Length; Aluminized Steel, Not Direct Fit-Some Adaptation Required
    Beginning Year1978
    CID305
    DrivetrainRWD
    Ending Year1979
    Engine FamilyChevy small block Gen I
    Engine Size5.0L/305
    Engine TypeV8
    Engine VIN CodeU
    Liter5.0
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1978
    CID350
    DrivetrainRWD
    Ending Year1979
    Engine FamilyOLDSMOBILE V8 DIESEL
    Engine Size5.7L/350
    Engine TypeV8
    Engine VIN CodeZ
    Liter5.7
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes70 Series™ Big Block II Muffler; 2.5 in. Offset Inlet/Opposite Side Offset Outlet; Case Dimensions 5 in. x 10 in. x 22 in.; 28 in. Overall Length; Aluminized Steel, Not Direct Fit-Some Adaptation Required
    Beginning Year1978
    CID350
    DrivetrainRWD
    Ending Year1979
    Engine FamilyOLDSMOBILE V8 DIESEL
    Engine Size5.7L/350
    Engine TypeV8
    Engine VIN CodeZ
    Liter5.7
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1978
    CID454
    DrivetrainRWD
    Ending Year1979
    Engine FamilyChevy big block Mark IV
    Engine Size7.4L/454
    Engine TypeV8
    Engine VIN CodeS
    Liter7.4
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes70 Series™ Big Block II Muffler; 2.5 in. Offset Inlet/Opposite Side Offset Outlet; Case Dimensions 5 in. x 10 in. x 22 in.; 28 in. Overall Length; Aluminized Steel, Not Direct Fit-Some Adaptation Required
    Beginning Year1978
    CID454
    DrivetrainRWD
    Ending Year1979
    Engine FamilyChevy big block Mark IV
    Engine Size7.4L/454
    Engine TypeV8
    Engine VIN CodeS
    Liter7.4
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1978
    CID250
    DrivetrainRWD
    Ending Year1980
    Engine FamilyCHEVROLET L6 GAS
    Engine Size4.1L/250
    Engine TypeL6
    Engine VIN CodeD
    Liter4.1
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes70 Series™ Big Block II Muffler; 2.5 in. Offset Inlet/Opposite Side Offset Outlet; Case Dimensions 5 in. x 10 in. x 22 in.; 28 in. Overall Length; Aluminized Steel, Not Direct Fit-Some Adaptation Required
    Beginning Year1978
    CID250
    DrivetrainRWD
    Ending Year1980
    Engine FamilyCHEVROLET L6 GAS
    Engine Size4.1L/250
    Engine TypeL6
    Engine VIN CodeD
    Liter4.1
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes70 Series™ Big Block II Muffler; 2.5 in. Offset Inlet/Opposite Side Offset Outlet; Case Dimensions 5 in. x 10 in. x 22 in.; 28 in. Overall Length; Aluminized Steel, Not Direct Fit-Some Adaptation Required
    Beginning Year1978
    CID292
    DrivetrainRWD
    Ending Year1980
    Engine FamilyCHEVROLET L6 GAS
    Engine Size4.8L/292
    Engine TypeL6
    Engine VIN CodeT
    Liter4.8
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1978
    CID350
    DrivetrainRWD
    Ending Year1980
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
    Engine TypeV8
    Engine VIN CodeL
    Liter5.7
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes70 Series™ Big Block II Muffler; 2.5 in. Offset Inlet/Opposite Side Offset Outlet; Case Dimensions 5 in. x 10 in. x 22 in.; 28 in. Overall Length; Aluminized Steel, Not Direct Fit-Some Adaptation Required
    Beginning Year1978
    CID350
    DrivetrainRWD
    Ending Year1980
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
    Engine TypeV8
    Engine VIN CodeL
    Liter5.7
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1979
    CID250
    DrivetrainRWD
    Ending Year1980
    Engine FamilyCHEVROLET L6 GAS
    Engine Size4.1L/250
    Engine TypeL6
    Engine VIN CodeD
    Liter4.1
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1980
    CID292
    DrivetrainRWD
    Ending Year1980
    Engine FamilyCHEVROLET L6 GAS
    Engine Size4.8L/292
    Engine TypeL6
    Engine VIN CodeT
    Liter4.8
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1980
    CID305
    DrivetrainRWD
    Ending Year1980
    Engine FamilyChevy small block Gen I
    Engine Size5.0L/305
    Engine TypeV8
    Engine VIN CodeG
    Liter5.0
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes70 Series™ Big Block II Muffler; 2.5 in. Offset Inlet/Opposite Side Offset Outlet; Case Dimensions 5 in. x 10 in. x 22 in.; 28 in. Overall Length; Aluminized Steel, Not Direct Fit-Some Adaptation Required
    Beginning Year1980
    CID305
    DrivetrainRWD
    Ending Year1980
    Engine FamilyChevy small block Gen I
    Engine Size5.0L/305
    Engine TypeV8
    Engine VIN CodeG
    Liter5.0
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1980
    CID350
    DrivetrainRWD
    Ending Year1980
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
    Engine TypeV8
    Engine VIN CodeM
    Liter5.7
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes70 Series™ Big Block II Muffler; 2.5 in. Offset Inlet/Opposite Side Offset Outlet; Case Dimensions 5 in. x 10 in. x 22 in.; 28 in. Overall Length; Aluminized Steel, Not Direct Fit-Some Adaptation Required
    Beginning Year1980
    CID350
    DrivetrainRWD
    Ending Year1980
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
    Engine TypeV8
    Engine VIN CodeM
    Liter5.7
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1980
    CID400
    DrivetrainRWD
    Ending Year1980
    Engine FamilyChevy small block Gen I
    Engine Size6.6L/400
    Engine TypeV8
    Engine VIN CodeX
    Liter6.6
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1980
    CID400
    DrivetrainRWD
    Ending Year1980
    Engine FamilyChevy small block Gen I
    Engine Size6.6L/400
    Engine TypeV8
    Engine VIN CodeX
    Liter6.6
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes70 Series™ Big Block II Muffler; 2.5 in. Offset Inlet/Opposite Side Offset Outlet; Case Dimensions 5 in. x 10 in. x 22 in.; 28 in. Overall Length; Aluminized Steel, Not Direct Fit-Some Adaptation Required
    Beginning Year1980
    CID400
    DrivetrainRWD
    Ending Year1980
    Engine FamilyChevy small block Gen I
    Engine Size6.6L/400
    Engine TypeV8
    Engine VIN CodeX
    Liter6.6
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN
  • Application Notes2.50 Inlet 2.50 Outlet ; 2.50 Inlet 2.50 Outlet , 2.50 Inlet 2.50 Outlet
    Beginning Year1980
    CID454
    DrivetrainRWD
    Ending Year1980
    Engine FamilyChevy big block Mark IV
    Engine Size7.4L/454
    Engine TypeV8
    Engine VIN CodeW
    Liter7.4
    MakeCHEVROLET
    ModelC10
    RegionUSA
    SubmodelBIG TEN

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