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Hooker Headers 21021

4" Sidetube Slip-In Mufflers Glasspack



Hooker Headers 21021

Part Number: 520-21021

4'' Sidetube Slip-In Mufflers
  • Glasspack
  • $194.95
    Ships
    Made In USA
    FREE Shipping

    Hooker Headers 21021 Details

    Slip-In Mufflers

  • Long Lasting
  • Easily Removed For Racing
  • Quieter Than Glasspack
  • High Level Of Sound Control
  • Will Not Restrict Engine Efficiency

  • Specifications:

    Diameter (in.)
    4
    Inlet Size (in.)
    4
    Outlet Size (in.)
    4
    Body Height (in.)
    N/A
    Overall Length (in.)
    NA
    Shape
    Round
    Body Width (in.)
    N/A
    Body Length (in.)
    N/A
    Material
    N/A
    Position
    N/A
    Inlet Type
    OEM
    Outlet Type
    OEM
    Inlet Position
    OEM
    Outlet Position
    OEM
    Exhaust Insert Material
    Stainless steel
    Exhaust Insert Style
    Louvered core
    Quantity
    Sold as a pair
    Manufacturer's Part Number:
    21021HKR


    Hooker Headers Sidetube Slip-In Mufflers are designed specifically for vehicles with 4'' diameter sidepipes. They are constructed using 16-gauge aluminized steel for durability and can be removed easily for racing.


    Available in three core styles to suit your sound control and performance needs:
    The reverse flow design for small and big block engines does not restrict engine efficiency and has the highest level of sound control for the quietest possible configuration.

    The glasspack design has greater flow capacity & is louder than the reverse flow mufflers. They produce that classic 1960's performance sound.

    For 1965-74 Corvette applications, the maximum flow design has a straight-through, high-flow perforated core that operates at 99% efficiency with average power gains of 23% over open headers. Testing on a 1968 Corvette with a 427 engine yielded an increase of 40 horsepower and 20 ft/lbs of torque, which is more than an undercar exhaust with turbo mufflers.

    Features
  • Fits 4" Sidetube Systems
  • Long Lasting
  • Easily Removed for Racing
  • Will Not Restrict Engine Efficiency
  • Sold in Pairs

  • Does this fit your vehicle?

    Narrow Results

    1974 CHEVROLET CORVETTE

    • CC: 5736
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: T
    • CUI: 350
    • EngineType: V8

    1974 CHEVROLET CORVETTE

    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: T
    • CUI: 350
    • EngineType: V8

    1963-1965 CHEVROLET CORVETTE

    • CC: 5358
    • Liter: 5.3
    • SubModel: BASE
    • CUI: 327
    • EngineType: V8

    1972 CHEVROLET CORVETTE

    • CC: 5737
    • Liter: 5.7
    • SubModel: BASE
    • EngineType: V8

    1969-1971 CHEVROLET CORVETTE

    • CC: 5736
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8

    1965 CHEVROLET CORVETTE

    • Liter: 6.5
    • SubModel: BASE
    • CUI: 396
    • EngineType: V8

    1975 CHEVROLET CORVETTE

    • Liter: 5.7
    • Aspiration: N
    • SubModel: STINGRAY
    • Engine Vin: T
    • CUI: 350
    • EngineType: V8

    1973-1974 CHEVROLET CORVETTE

    • CC: 7439
    • Liter: 7.4
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: Z
    • CUI: 454
    • EngineType: V8

    1972 CHEVROLET CORVETTE

    • CC: 7439
    • Liter: 7.4
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: W
    • CUI: 454
    • EngineType: V8

    1972 CHEVROLET CORVETTE

    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8

    1978-1979 CHEVROLET CORVETTE

    • EngineType: ALL
    • SubModel: ALL

    1977 CHEVROLET CORVETTE

    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8

    1970-1971 CHEVROLET CORVETTE

    • CC: 7439
    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8

    1968-1969 CHEVROLET CORVETTE

    • Liter: 7.0
    • SubModel: BASE
    • CUI: 427
    • EngineType: V8

    1970-1974 CHEVROLET CORVETTE

    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8

    1963-1965 CHEVROLET CORVETTE

    • CC: 5358
    • Liter: 5.3
    • SubModel: BASE
    • CUI: 327
    • EngineType: V8

    1982 CHEVROLET CORVETTE

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8

    1976 CHEVROLET CORVETTE

    • Liter: 5.7
    • Aspiration: N
    • SubModel: STINGRAY
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8

    1968 CHEVROLET CORVETTE

    • CC: 5358
    • Liter: 5.3
    • SubModel: BASE
    • CUI: 327
    • EngineType: V8

    1980-1981 CHEVROLET CORVETTE

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8

    1974 CHEVROLET CORVETTE

    • CC: 5737
    • Liter: 5.7
    • SubModel: BASE
    • EngineType: V8

    1970-1974 CHEVROLET CORVETTE

    • CC: 7441
    • Liter: 7.4
    • SubModel: BASE
    • EngineType: V8

    1980 CHEVROLET CORVETTE

    • CC: 5031
    • Liter: 5.0
    • SubModel: BASE
    • EngineType: V8

    1966-1968 CHEVROLET CORVETTE

    • Liter: 5.4
    • EngineType: V8
    • SubModel: BASE

    1982 CHEVROLET CORVETTE

    • EngineType: ALL
    • SubModel: COLLECTOR'S EDITION

    1967-1969 CHEVROLET CORVETTE

    • CC: 6998
    • Liter: 7.0
    • SubModel: BASE
    • CUI: 427
    • EngineType: V8

    1966 CHEVROLET CORVETTE

    • Liter: 7.0
    • SubModel: BASE
    • CUI: 427
    • EngineType: V8

    1969-1971 CHEVROLET CORVETTE

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8

    1972 CHEVROLET CORVETTE

    • CC: 5736
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8
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