Product Summary

Crossmember-Back Exhaust System Type, RWD Drivetrain

  • Specially designed for the 1962-67 Nova platform
  • Features a durable stainless steel construction
  • Engineered to have multiple tailpipe exit options
  • Includes their patented Delta Flow technology
  • Each set comes with limited lifetime warranty

Key Specs

MFG. Part #817673
Exhaust System TypeCrossmember-Back
Single or DualDual
Exhaust Tubing Diameter2-1/2 Inch

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Flowmaster 817673 Details

Flowmaster's American Thunder Crossmember-back exhaust system for the 1962-1967 Chevrolet Chevy II/Nova is perfect for the person looking for an aggressive sound level inside and outside of the car, with all of the performance benefits that you would expect from Flowmaster. This bolt-on DOS (Dual Out Side) system features stainless steel Super 44 Series mufflers and dual 2.50" 409S Stainless Steel tailpipes and a welded H-Pipe. Like all Flowmaster systems, the pipes are all mandrel bent to reduce any restrictions and maximize performance. The exhaust system is manufactured in the USA and is covered by Flowmaster's Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.

  • Stainless Steel Construction
  • Dyno Tuned For Maximum Performance
  • Patented Delta Flow Technology
  • Lifetime Limited Warranty


1965-1966 Chevrolet Chevy II 327 CID/5.4L V8
1965-1967 Chevrolet Chevy II 327 CID/5.3L V8
1963-1967 Chevrolet Chevy II 4.6L V8


Flowmaster 817673 Specifications

MFG. Part #817673
Exhaust System TypeCrossmember-Back
Single or DualDual
Exhaust Tubing Diameter2-1/2 Inch
Exhaust ExitDual Split Side
Sound LevelModerate/Aggressive
Muffler(s) IncludedYes
Muffler Quantity2
Muffler ConnectionsSingle Inlet | Single Outlet
Muffler TypeWelded Baffle
Exhaust Tip IncludedYes
Exhaust Tip Quantity2
Exhaust Tip ShapeRound
Exhaust Tip CutAngle
Exhaust Tip Edge StyleNon-Rolled Edge | Single-Wall
Exhaust Tip Size3.00"
Exhaust Tip Length4.75"
Exhaust System Material409S Stainless Steel
Exhaust System FinishNatural
Exhaust Pipe ColorNatural
Muffler Body ShapeOval
Muffler SeriesSuper 44 Series
Muffler Material409 Stainless Steel
Muffler ColorGrey
Exhaust Tip Material304 Stainless Steel
Exhaust Tip FinishPolished
Exhaust Tip ColorNatural
Mount TypeFlanged
Inlet QuantityDual
Inlet Size2.50"
Outlet Size2.50"
Tailpipe Diameter2.5"
Catalytic Converter(s) IncludedNo
Hardware IncludedYes
Heat ShieldNo
Sold in QuantityKit
GTIN Code700042030675
Exit LocationSide