Hooker Sidetube Slip-In Mufflers

4" Sidetube Slip-In Glass Pack Muffler; Sold In Pairs.

PART# 21021HKR

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$241.95   Suggested Retail
$195.26   Holleydays Price
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For 4" sidetube sound control, Hooker builds long lasting slip-in mufflers. These mufflers are easily removed for racing purposes and are available in a performance style glasspack or our quieter all metal reverse flow style for small and big block applications. Hooker mufflers produce a high level of sound control without restricting engine efficiency. Sold in pairs.


  • Fits 4" Side Tube systems
  • Performance Style Glass Pack Design
  • Long Lasting
  • Easily Removed For Racing
  • Will Not Restrict Engine Efficiency


Emission Code5
Inlet4 inch center
Inlet Diameter (in)4
Inlet PositionCenter
Outlet4 inch center
Outlet Diameter (in)4
Product TypeMuffler
Type of MufflerSide-Tube Slip-In
Part Number21021HKR


This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.


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      *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

      Some parts are not legal for use in California or other states with similar regulations.

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