Flowmaster 817457 Header-Back System 409S for 78-88 GM A-Body

Flowmaster 817457 Header-back System 409S - Dual Rear Exit - American Thunder® - Aggressive Sound

For the person who is looking for a complete Header-back dual exhaust system with an aggressive tone. With easy fit in mind, these systems are mandrel bent for maximum performance and include specially selected mufflers. This America Thunder system delivers an aggressive interior and exterior tone and is suited to the enthusiast who wants their performance to be heard. 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. Note, requires the use of a double hump cross member.

Features:

• Mandrel bent 16 gauge 409 stainless tubing
• Aggressive and powerful exterior exhaust tone
• Includes hangers and hardware for easy installation
• Header back system
• Premium Flowmaster quality

Product Specification:

• 2WD/4WD: 2WD
• Exhaust series: American Thunder®
• Exit Position: Dual Rear Exit
• Heat shield: None
• Inlet diameter (inches): 2.50
• Material: Stainless Steel
• Muffler part number: 842548
• Muffler quantity: 2
• Muffler series: Super 44 Series
• Outlet diameter (inches): 2.50
• Single/Dual: Dual
• Sound level: Aggressive Sound
• System type: Header-back System
• Tip diameter (inches): 3.00
• Tip quantity: 2
• Tubing diameter (inches): 2.50

Fitments:

• 1986-1987 Buick Regal Base V8, 5.0L
• 1978-1980 Buick Regal Base V8, 5.0L
• 1979-1980 Buick Regal Base V8, 4.9L
• 1980-1981 Buick Regal Base V8, 4.3L
• 1978-1980 Buick Regal Limited V8, 5.0L
• 1979-1980 Buick Regal Limited V8, 4.9L
• 1980-1981 Buick Regal Limited V8, 4.3L
• 1986-1987 Buick Regal Limited V8, 5.0L
• 1979-1988 Chevrolet Monte Carlo Base V8, 5.0L
• 1979-1982 Chevrolet Monte Carlo Base V8, 4.4L
• 1981 Chevrolet Monte Carlo Base V8, 5.7L
• 1983 Chevrolet Monte Carlo CL V8, 5.0L
• 1979-1981 Chevrolet Monte Carlo Landau V8, 4.4L
• 1981 Chevrolet Monte Carlo Landau V8, 5.7L
• 1978-1981 Chevrolet Monte Carlo Landau V8, 5.0L
• 1986-1988 Chevrolet Monte Carlo LS V8, 5.0L
• 1978-1980 Chevrolet Monte Carlo Sport V8, 5.0L
• 1980 Chevrolet Monte Carlo Sport V8, 4.4L
• 1983-1988 Chevrolet Monte Carlo SS V8, 5.0L
• 1980 Oldsmobile Cutlass Base V8, 4.3L
• 1980 Oldsmobile Cutlass Base V8, 5.0L
• 1980 Oldsmobile Cutlass Base V8, 5.7L
• 1980 Oldsmobile Cutlass LS V8, 5.7L
• 1980-1981 Oldsmobile Cutlass LS V8, 4.3L
• 1980 Oldsmobile Cutlass LS V8, 5.0L
• 1982-1984 Oldsmobile Cutlass Calais Base V8, 5.0L
• 1978-1982 Oldsmobile Cutlass Calais Base V8, 4.3L
• 1978-1980 Oldsmobile Cutlass Calais Base V8, 5.0L
• 1979-1980 Oldsmobile Cutlass Calais Base V8, 5.7L
• 1983-1984 Oldsmobile Cutlass Calais Hurst V8, 5.0L
• 1978 Oldsmobile Cutlass Salon 442 V8, 5.0L
• 1979 Oldsmobile Cutlass Salon 442 V8, 5.7L
• 1985-1986 Oldsmobile Cutlass Salon 442 V8, 5.0L
• 1978-1980 Oldsmobile Cutlass Salon Base V8, 4.3L
• 1978-1980 Oldsmobile Cutlass Salon Base V8, 5.0L
• 1979 Oldsmobile Cutlass Salon Base V8, 5.7L
• 1985-1987 Oldsmobile Cutlass Salon Base V8, 5.0L
• 1987 Oldsmobile Cutlass Supreme 442 V8, 5.0L
• 1978-1982 Oldsmobile Cutlass Supreme Base V8, 4.3L
• 1978-1980 Oldsmobile Cutlass Supreme Base V8, 5.0L
• 1978 Oldsmobile Cutlass Supreme Base V8, 5.7L
• 1979-1980 Oldsmobile Cutlass Supreme Base V8, 5.7L
• 1982-1987 Oldsmobile Cutlass Supreme Base V8, 5.0L
• 1978-1980 Oldsmobile Cutlass Supreme Brougham V8, 5.0L
• 1979-1980 Oldsmobile Cutlass Supreme Brougham V8, 5.7L
• 1982-1987 Oldsmobile Cutlass Supreme Brougham V8, 5.0L
• 1978-1982 Oldsmobile Cutlass Supreme Brougham V8, 4.3L
• 1988 Oldsmobile Cutlass Supreme Classic V8, 5.0L
• 1988 Oldsmobile Cutlass Supreme Classic Brougham V8, 5.0L
• 1981 Oldsmobile Cutlass Supreme LS V8, 4.3L
• 1978-1980 Pontiac Grand Am Base V8, 4.9L
• 1978-1980 Pontiac Grand Am Base V8, 5.0L
• 1978-1980 Pontiac Grand Prix Base V8, 4.9L
• 1978-1987 Pontiac Grand Prix Base V8, 5.0L
• 1980-1981 Pontiac Grand Prix Base V8, 4.3L
• 1984-1987 Pontiac Grand Prix LE V8, 5.0L
• 1978-1980 Pontiac Grand Prix LJ V8, 4.9L
• 1978-1983 Pontiac Grand Prix LJ V8, 5.0L
• 1980-1981 Pontiac Grand Prix LJ V8, 4.3L
• 1978-1980 Pontiac Grand Prix SJ V8, 4.9L
• 1978-1980 Pontiac Grand Prix SJ V8, 5.0L

Note: Requires the use of a double hump cross member. For off road use only.
1978 to 1988 GM A-Body and G-Body with a V8 engine. Requires the use of a inch double hump inch crossmember.