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Hooker Sidetube Slip-In Mufflers

Maximum Flow 4" Sidetube Slip-In Muffler; These high performance mufflers produce an average of 23% more power than open headers. Sold in pairs.

Part # 21046HKR Be the first to write a review
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This high performance muffler has been developed for vehicles with 4" sidepipes such as 1965-74 Corvettes or vehicles equipped with Hooker Super Competition Roadster and Side Mount Headers. These mufflers produce an average of 23% more power than open headers and feature a high-flow, perforated core that operates at 99% efficiency. High temperature packing material absorbs noise while producing a powerful mellow sound. These mufflers, as tested on a 1968 Corvette with a 427 cu inch engine increased horsepower by 40 at a peak of 5500 RPM and 20 ft.-lbs. at peak of 4500RPM versus a leading aftermarket undercar header/turbo-style muffler combination. The outer case is constructed of durable 16 gauge aluminized steel protected by electrostatically applied high-temperature black paint. The inlet/outlet is a 2.5 perforated core in a 4" casing. Sold in pairs.


  • Fits 4" Side Tube systems
  • Maximum Flow Muffler Design
  • Easily Removed For Racing
  • Durable 16 Gauge Outer aluminized Steel Case
  • Electrostatically applied High-Temp Black Paint Finish
  • 2-1/2" to 4" contoured inlet/outlets
  • 2-1/2" high flow perforated core in a 4” casing
  • 2.5" Perforated Core Surrounded by High temperature Sound Absorbing Packing Material

About Hooker

Since the golden era of drag racing in the 1960s, Hooker has helped more racers reach the Winner's Circle than any other header company. From the stoplight to the race track, Hooker exhaust technology will make your car or truck perform and sound better.

Automotive Item GradeHigh Performance
Body Height (in)4
Body Length (in)33.25
Body Width (in)4
Brand Hooker
Emission Code5
Inlet Connection TypePipe Connection
Inlet Diameter (in)4
Inlet PositionCenter
MaterialAluminized Steel
Muffler SeriesSide-Tube Slip-In
Muffler TypeSide-Tube Slip-In
Outlet Connection TypePipe Connection
Outlet Diameter (in)4
Outlet PositionCenter
Overall Length (in)33.25
Product TypeStreet Mufflers
Sound LevelAggressive Sound
Type of MufflerSide-Tube Slip-In
Vehicle TypeClassic Muscle Car
Street Rod
Part Number21046HKR

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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