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Flowmaster Force II Cat-back Exhaust System

1986-1990 Chevrolet Corvette with 5.7L engine.

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Delta Flow
This Force II® system is specifically designed for 1986-1990 Chevrolet Corvette's with the 5.7L engine. The system starts at the factory ball flange at the rear of the car flowing into a Scavenger Series® Y-collector splitting the system into duals. The 2.50-inch mandrel-bent aluminized steel tubing flows into a pair of specially designed 60 Series™ Delta Flow® mufflers keeping the interior tone down to a minimum, with a deep mellow performance exterior tone. The system is finished off with dual 2.50-inch brushed stainless steel tips on each muffler and uses the factory hanger locations making installation a breeze. Force II systems deliver a moderate exterior tone and a mild interior tone, and are suited to customers looking for efficiency improvements without a lot of interior noise. Like all Flowmaster® systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.


  • Includes Hangers and Hardware for an Easy Installation
  • Specially Designed 60 Series Performance Mufflers
  • Mandrel-bent 16 Gauge Aluminized Steel Tubing
  • Quad 2.50-inch Brushed Stainless Steel Tips
  • Connects After Factory Catalytic Converter
  • Uses the Factory Hanger Locations
  • Mild Performance Exterior Sound
  • Minimal Interior Tone

About Flowmaster

Flowmaster® is a household name, and for good reason. They've built legendary exhaust systems and mufflers for decades, and now offer performance air intakes, catalytic converters, and headers to give your hot rod performance to match the iconic Flowmaster sound.

Brand Flowmaster
Emission Code5
Exhaust SeriesForce II
Exit PositionDual Out Rear
Heat ShieldNo
Inlet Diameter (in)2.25
MaterialAluminized Steel
Muffler Part Number9424501-L, 9424501-R
Muffler Quantity2
Muffler Series50 Series Delta Flow
Outlet Diameter (in)2.5
Product TypeExhaust System
Single DualDual
Sound LevelMild
System TypeCat-back
Tip Diameter (in)2.5
Tip Quantity4
Tubing Diameter (in)2.5
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number17153

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.

Fits 1986-1990 Chevrolet Corvette with 5.7L engine.

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