Description

Flowmaster is proud to introduce our American Thunder dual exhaust system for 1967-1974 Camaro and Firebird, and 1968-1974 Nova. The system features our exclusive 80 Series Crossflow performance muffler that tucks up high behind the rear differential. Other features include all mandrel-bent dual 2.50-inch head pipes with a built-in H-pipe crossover and dual 2.50-inch tailpipes for a deep rich sound and optimum performance. This Crossmember-Back aluminized steel exhaust system gives these classic muscle cars a moderate tone inside and out. The system includes all parts, hardware and illustrated instructions and is covered by our 3-year Limited Warranty. If you prefer Stainless steel construction, check out optional system# 817104 which comes with a Lifetime Limited Warranty. Notes: Does not include manifold downpipes or header reducer cones. Convertible models will require adding 3/8-inch of shims to the stock factory X-brace for clearance or purchasing Hotchkis Performance Convertible brace Part# 1404.

Features

  • H-pipe Crossover for Maximum Power and Deep Tone
  • Includes Hangers and Hardware for Easy Installation
  • Mandrel-bent 16-gauge Aluminized Steel Tubing
  • Does Not Include Manifold Downpipes or Header Reducers
  • Moderate Exterior Exhaust Tone
  • Maximum Ground Clearance
  • Crossmember-Back System

Specifications

2WD/4WD2WD
BrandFlowmaster
California Proposition 65 RequiredNo
Catalytic Converter QuantityNot Included
Clamping TypeU Bolt
Clamps IncludedYes
Emission Code5
Exhaust SeriesAmerican Thunder
Exhaust Tip QuantitySold Separately
Exit PositionDual Out Rear
Exit StyleDual Out Rear
FinishAluminized
Gasket Or Seal IncludedNo
Grade TypePerformance
Hangers IncludedYes
Heat ShieldNo
Inlet Diameter2.5
Inlet TypeWeld-On
Main Piping Diameter2.50
Main Piping Diameter2-1/2
MaterialAluminized Steel
Mounting Bracket IncludedYes
Muffler (Rear) Body Height4
Muffler (Rear) Body Length18
Muffler (Rear) Body Width9.75
Muffler (Rear) FinishAluminized
Muffler (Rear) TypeChambered
Muffler Body MaterialAluminized Steel
Muffler Body ShapeOval
Muffler FinishBlack High-Temperature Paint Finish
Muffler Flanged InletNo
Muffler Flanged OutletNo
Muffler Inlet ConnectionSlip-Fit
Muffler Inlet Inside Diameter2.5
Muffler Inlet Outside Diameter2.63
Muffler Outlet ConnectionSlip-Fit
Muffler Outlet Quantity1
Muffler Part Number42585
Muffler Quantity1
Muffler Series80 Series Crossflow
Muffler TypeChambered
Outlet Diameter2.5
Pipe MaterialAluminized Steel
Product TypeExhaust System
Sale CategoryExhaust
Single DualDual
Sound LevelModerate
Spring Bolt Kit IncludedNo
System TypeCrossmember-back
Tail Pipe Outlet Outside Diameter2.5
Tail Pipe Quantity2
Tail Pipe Tapered OutletNo
Tip QuantityNot Included
Tip ShapeRound
Tube Diameter2.5 inch
Tubing Diameter2.5
TypeCrossmember-back
Type of ExhaustCrossmember-back
Valve IncludedNo
Valve TypeNot Included

Compatibility

  • 1967 - 1972 Chevrolet Camaro SS 5.7
  • 1967 - 1969 Chevrolet Camaro Base 5.3
  • 1967 - 1969 Chevrolet Camaro RS 5.3
  • 1967 - 1969 Chevrolet Camaro SS 6.5
  • 1967 - 1969 Chevrolet Camaro Z28 4.9
  • 1967 - 1967 Chevrolet Camaro RS 5.7
  • 1969 - 1973 Chevrolet Camaro RS 5.7
  • 1967 - 1967 Chevrolet Camaro Base 6.5
  • 1967 - 1967 Chevrolet Camaro RS 6.5
  • 1969 - 1974 Chevrolet Camaro Base 5.7
  • 1969 - 1973 Chevrolet Camaro Base 5.0
  • 1969 - 1973 Chevrolet Camaro RS 5.0
  • 1969 - 1969 Chevrolet Camaro Base 7.0
  • 1969 - 1969 Chevrolet Camaro RS 7.0
  • 1970 - 1974 Chevrolet Camaro Z28 5.7
  • 1970 - 1972 Chevrolet Camaro SS 6.6
  • 1971 - 1972 Chevrolet Camaro Base 6.6
  • 1972 - 1972 Chevrolet Camaro Z28 6.6
  • 1973 - 1974 Chevrolet Camaro LT 5.7
  • 1973 - 1973 Chevrolet Camaro LT 5.0
  • 1969 - 1974 Chevrolet Nova Base 5.7
  • 1969 - 1973 Chevrolet Nova Base 5.0
  • 1969 - 1970 Chevrolet Nova Base 6.5
  • 1970 - 1972 Chevrolet Nova Base 6.6
  • 1970 - 1971 Chevrolet Nova Base 7.4
  • 1973 - 1974 Chevrolet Nova Custom 5.7
  • 1973 - 1973 Chevrolet Nova Custom 5.0
  • 1967 - 1974 Pontiac Firebird Base 6.6
  • 1967 - 1969 Pontiac Firebird 400 6.6
  • 1967 - 1967 Pontiac Firebird 326 5.3
  • 1967 - 1967 Pontiac Firebird Base 5.3
  • 1967 - 1967 Pontiac Firebird HO 5.3
  • 1967 - 1967 Pontiac Firebird HO 6.6
  • 1968 - 1974 Pontiac Firebird Base 5.7
  • 1968 - 1969 Pontiac Firebird 350 5.7
  • 1968 - 1968 Pontiac Firebird HO 5.7
  • 1969 - 1974 Pontiac Firebird Trans Am 6.6
  • 1969 - 1969 Pontiac Firebird 350 HO 5.7
  • 1970 - 1974 Pontiac Firebird Esprit 5.7
  • 1970 - 1974 Pontiac Firebird Esprit 6.6
  • 1970 - 1974 Pontiac Firebird Formula 5.7
  • 1970 - 1974 Pontiac Firebird Formula 6.6
  • 1970 - 1974 Pontiac Firebird Trans Am 5.7
  • 1971 - 1974 Pontiac Firebird Base 7.5
  • 1971 - 1974 Pontiac Firebird Esprit 7.5
  • 1971 - 1974 Pontiac Firebird Formula 7.5
  • 1971 - 1974 Pontiac Firebird Trans Am 7.5

Flowmaster is proud to introduce our American Thunder dual exhaust system for 1967-1974 Camaro and Firebird, and 1968-1974 Nova. The system features our exclusive 80 Series Crossflow performance muffler that tucks up high behind the rear differential. Other features include all mandrel-bent dual 2.50-inch head pipes with a built-in H-pipe crossover and dual 2.50-inch tailpipes for a deep rich sound and optimum performance. This Crossmember-Back aluminized steel exhaust system gives these classic muscle cars a moderate tone inside and out. The system includes all parts, hardware and illustrated instructions and is covered by our 3-year Limited Warranty. If you prefer Stainless steel construction, check out optional system# 817104 which comes with a Lifetime Limited Warranty. Notes: Does not include manifold downpipes or header reducer cones. Convertible models will require adding 3/8-inch of shims to the stock factory X-brace for clearance or purchasing Hotchkis Performance Convertible brace Part# 1404.

Features

  • H-pipe Crossover for Maximum Power and Deep Tone
  • Includes Hangers and Hardware for Easy Installation
  • Mandrel-bent 16-gauge Aluminized Steel Tubing
  • Does Not Include Manifold Downpipes or Header Reducers
  • Moderate Exterior Exhaust Tone
  • Maximum Ground Clearance
  • Crossmember-Back System
2WD/4WD2WD
BrandFlowmaster
California Proposition 65 RequiredNo
Catalytic Converter QuantityNot Included
Clamping TypeU Bolt
Clamps IncludedYes
Emission Code5
Exhaust SeriesAmerican Thunder
Exhaust Tip QuantitySold Separately
Exit PositionDual Out Rear
Exit StyleDual Out Rear
FinishAluminized
Gasket Or Seal IncludedNo
Grade TypePerformance
Hangers IncludedYes
Heat ShieldNo
Inlet Diameter2.5
Inlet TypeWeld-On
Main Piping Diameter2.50
Main Piping Diameter2-1/2
MaterialAluminized Steel
Mounting Bracket IncludedYes
Muffler (Rear) Body Height4
Muffler (Rear) Body Length18
Muffler (Rear) Body Width9.75
Muffler (Rear) FinishAluminized
Muffler (Rear) TypeChambered
Muffler Body MaterialAluminized Steel
Muffler Body ShapeOval
Muffler FinishBlack High-Temperature Paint Finish
Muffler Flanged InletNo
Muffler Flanged OutletNo
Muffler Inlet ConnectionSlip-Fit
Muffler Inlet Inside Diameter2.5
Muffler Inlet Outside Diameter2.63
Muffler Outlet ConnectionSlip-Fit
Muffler Outlet Quantity1
Muffler Part Number42585
Muffler Quantity1
Muffler Series80 Series Crossflow
Muffler TypeChambered
Outlet Diameter2.5
Pipe MaterialAluminized Steel
Product TypeExhaust System
Sale CategoryExhaust
Single DualDual
Sound LevelModerate
Spring Bolt Kit IncludedNo
System TypeCrossmember-back
Tail Pipe Outlet Outside Diameter2.5
Tail Pipe Quantity2
Tail Pipe Tapered OutletNo
Tip QuantityNot Included
Tip ShapeRound
Tube Diameter2.5 inch
Tubing Diameter2.5
TypeCrossmember-back
Type of ExhaustCrossmember-back
Valve IncludedNo
Valve TypeNot Included
  • 1967 - 1972 Chevrolet Camaro SS 5.7
  • 1967 - 1969 Chevrolet Camaro Base 5.3
  • 1967 - 1969 Chevrolet Camaro RS 5.3
  • 1967 - 1969 Chevrolet Camaro SS 6.5
  • 1967 - 1969 Chevrolet Camaro Z28 4.9
  • 1967 - 1967 Chevrolet Camaro RS 5.7
  • 1969 - 1973 Chevrolet Camaro RS 5.7
  • 1967 - 1967 Chevrolet Camaro Base 6.5
  • 1967 - 1967 Chevrolet Camaro RS 6.5
  • 1969 - 1974 Chevrolet Camaro Base 5.7
  • 1969 - 1973 Chevrolet Camaro Base 5.0
  • 1969 - 1973 Chevrolet Camaro RS 5.0
  • 1969 - 1969 Chevrolet Camaro Base 7.0
  • 1969 - 1969 Chevrolet Camaro RS 7.0
  • 1970 - 1974 Chevrolet Camaro Z28 5.7
  • 1970 - 1972 Chevrolet Camaro SS 6.6
  • 1971 - 1972 Chevrolet Camaro Base 6.6
  • 1972 - 1972 Chevrolet Camaro Z28 6.6
  • 1973 - 1974 Chevrolet Camaro LT 5.7
  • 1973 - 1973 Chevrolet Camaro LT 5.0
  • 1969 - 1974 Chevrolet Nova Base 5.7
  • 1969 - 1973 Chevrolet Nova Base 5.0
  • 1969 - 1970 Chevrolet Nova Base 6.5
  • 1970 - 1972 Chevrolet Nova Base 6.6
  • 1970 - 1971 Chevrolet Nova Base 7.4
  • 1973 - 1974 Chevrolet Nova Custom 5.7
  • 1973 - 1973 Chevrolet Nova Custom 5.0
  • 1967 - 1974 Pontiac Firebird Base 6.6
  • 1967 - 1969 Pontiac Firebird 400 6.6
  • 1967 - 1967 Pontiac Firebird 326 5.3
  • 1967 - 1967 Pontiac Firebird Base 5.3
  • 1967 - 1967 Pontiac Firebird HO 5.3
  • 1967 - 1967 Pontiac Firebird HO 6.6
  • 1968 - 1974 Pontiac Firebird Base 5.7
  • 1968 - 1969 Pontiac Firebird 350 5.7
  • 1968 - 1968 Pontiac Firebird HO 5.7
  • 1969 - 1974 Pontiac Firebird Trans Am 6.6
  • 1969 - 1969 Pontiac Firebird 350 HO 5.7
  • 1970 - 1974 Pontiac Firebird Esprit 5.7
  • 1970 - 1974 Pontiac Firebird Esprit 6.6
  • 1970 - 1974 Pontiac Firebird Formula 5.7
  • 1970 - 1974 Pontiac Firebird Formula 6.6
  • 1970 - 1974 Pontiac Firebird Trans Am 5.7
  • 1971 - 1974 Pontiac Firebird Base 7.5
  • 1971 - 1974 Pontiac Firebird Esprit 7.5
  • 1971 - 1974 Pontiac Firebird Formula 7.5
  • 1971 - 1974 Pontiac Firebird Trans Am 7.5

Best Sellers