Important Update on US Tariffs and Pricing [ DETAILS ]

877.454.7792 Contact Us Mon-Sat 10a-6p
DRIVEN BY CARE
Home

Flowmaster Header-Back Exhaust System 1040FM

Flowmaster Header-Back Exhaust System 1040FM
Flowmaster Header-Back Exhaust System 1040FM
$533.99 ea
NEWARRIVING SOONEstimated Ship Date 07/23/2025 (If Ordered Today)18 Available from HOLLEY PERFORMANCE PRODUCTS as of 07/04/2025
Model: 4004849
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
OVERSIZE 2
STORE PICKUP
[More Info]
This mandrel-bent headers-back exhaust system is custom designed for most 1968-1972 GM A-body cars and is perfect for the person looking for true dual exhaust system. This system comes complete minus the mufflers and allows you to choose the sound level of the Flowmaster performance mufflers you desire for your vehicle. System features include all mandrel-bent 3.00-inch aluminized steel tubing, an H-pipe to equalize the exhaust gas pressures and sound for maximum performance and maximum clearance. Designed for an easy fit, these systems covered by our 3-year Limited Warranty. Notes: Requires 3.00-inch Offset Inlet/Opposite side Offset Outlet such as part# 943048 (Super 44 Series) or 53058 (Super 50 Series) mufflers. Does Not Include Header Collector Adapter Cones or hardware. Does Not align with the factory Oldsmobile 442 bumper cutouts. Fabrication required for installation of H-pipe.
Features:
  • Exits Straight-out under the Rear Bumper
  • Mandrel-bent for Maximum Performance
  • High Clearance around Rear Differential
  • Designed for Double Off-set Mufflers
  • 16 Gauge Aluminzed Steel Tubing
  • Does Not Include Hardware
  • 3-year Limited Warranty
  • Includes H-pipe Kit
Fits 1968-1972 GM A-Body with V8 engine. Use Offset Inlet/Offset Outlet Mufflers Only. Fabrication required for installation of H-pipe.
Installation Notes:
Fits 1968-1972 GM A-Body with V8 engine. Use Offset Inlet/Offset Outlet Mufflers Only. Fabrication required for installation of H-pipe.
About Flowmaster

Manufacturer of performance exhaust systems, mufflers, performance air intakes, turbo boost modules, catalytic converters, race mufflers, headers and numerous exhaust accessories for late model cars, trucks, off-road, Jeeps, SUV’s, classic muscle cars, powersports vehicles and more. Flowmaster® gives you lots of exhaust choices with 12 designs of chambered mufflers, 3 styles of our exclusive “laminar-flow” mufflers and a new line of FlowFX “straight-through” performance mufflers, along with 5 sound categories of exhaust systems, giving you the customer, the power to custom tailor the sound of your vehicle whether you prefer mild, moderate or aggressive tones and sound levels. Since 1983, Flowmaster is the company you can trust, and has led the industry in offering only the best products you can buy for your vehicles.

Downloads:

Download Name File Size
fm_warranty_general.pdf88.58KB
1040.pdf33.78KB

Vehicle Fitment:

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Submodel Years Engine Fitment Notes
Buick GS 350 1968 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick GS 350 1969 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick GS 400 1968 6.6L / 400 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick GS 400 1969 6.6L / 400 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick GS 455 Base 1970 7.5L / 455 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick GS 455 GSX 1970 7.5L / 455 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick GS 455 1971 7.5L / 455 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick GS 455 1972 7.5L / 455 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick GS 1970 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick GS 1971 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick GS 1972 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick Skylark 350 1970 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick Skylark Base 1970 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick Skylark 1968 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick Skylark 1969 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick Skylark 1970 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick Skylark 1971 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Buick Skylark 1972 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet Chevelle Malibu 1968 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet Chevelle Malibu 1970 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet Chevelle SS 1970 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet Chevelle 1968 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet Chevelle 1969 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet Chevelle 1970 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet Chevelle 1971 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet Chevelle 1972 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet El Camino Base 1970 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet El Camino 1968 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet El Camino 1969 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet El Camino 1970 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet El Camino 1971 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet El Camino 1972 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet Monte Carlo 1970 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet Monte Carlo 1971 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Chevrolet Monte Carlo 1972 5.7L / 350 / V8 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Oldsmobile 442 1968 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Oldsmobile 442 1969 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Oldsmobile 442 1970 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Oldsmobile 442 1971 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Oldsmobile Cutlass Base 1968 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Oldsmobile Cutlass S 1968 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Oldsmobile Cutlass 1968 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Oldsmobile Cutlass 1969 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Oldsmobile Cutlass 1970 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Oldsmobile Cutlass 1971 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Oldsmobile Cutlass 1972 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Pontiac GTO 1968 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Pontiac GTO 1969 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Pontiac GTO 1970 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Pontiac GTO 1971 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Pontiac GTO 1972 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Pontiac LeMans 1968 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Pontiac LeMans 1969 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Pontiac LeMans 1970 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Pontiac LeMans 1971 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers
Pontiac LeMans 1972 Pipes Only; Mufflers Not IncludedUse Offset Inlet / Offset Outlet Mufflers

Specifications:

Automotive Item Grade High Performance
California Proposition 65 Required No
Color Gray
Emission Code 3
Exhaust Pipe Wall Maximum Gauge 16
Exit Position Dual Rear Exit
Material Aluminized Steel
Mount Type Uses New Hangers (Not Included)
Part Type Exhaust System Kit
Product Type Exhaust Accessories
Single Dual Dual
System Type Pipe Kit
Tip Diameter (in) 3
Tip Shape Round
Tip Style Straight Cut
Tube Diameter 3 inch
Tubing Diameter (in) 3
Type of Exhaust Header-Back
Warranty Time 36 Months

Reviews:

Write a Review
* Your Name:
* Email (This will not be displayed)
* Rating:
Comments:

Ask a question about

Flowmaster Header-Back Exhaust System 1040FM:
Reason for Inquiry:

Related Products

Pypes Cat Back Exhaust System 78-88 GM G-Body Split Rear Dual Exit 2.5 in Intermediate Pipe And Tailpipe Race Pro Mufflers/Hardware Incl Tip Not Incl Natural 409 Stainless Steel Exhaust SGG50R
Pypes Cat Back Exhaust System 78-88 GM G-Body Split Rear Dual Exit 2.5 in Intermediate Pipe And Tailpipe Race Pro Mufflers/Hardware Incl Tip Not Incl Natural 409 Stainless Steel Exhaust SGG50R
Model: 3957872
Condition: NEW
$1,194.99 kt
Pypes Cat Back Exhaust System 78-88 GM G-Body Split Rear Dual Exit 2.5 in Intermediate And Tail Pipe Street Pro Mufflers/Hardware Incl Tip Not Incl Natural 409 Stainless Steel Exhaust SGG53S
Pypes Cat Back Exhaust System 78-88 GM G-Body Split Rear Dual Exit 2.5 in Intermediate And Tail Pipe Street Pro Mufflers/Hardware Incl Tip Not Incl Natural 409 Stainless Steel Exhaust SGG53S
Model: 3957866
Condition: NEW
$1,206.99 kt
Pypes Cat Back Exhaust System 78-88 GM G-Body Split Rear Dual Exit 2.5 in Intermediate And Tail Pipe Violator Mufflers/Hardware Incl Tip Not Incl Natural 409 Stainless Steel Exhaust SGG53V
Pypes Cat Back Exhaust System 78-88 GM G-Body Split Rear Dual Exit 2.5 in Intermediate And Tail Pipe Violator Mufflers/Hardware Incl Tip Not Incl Natural 409 Stainless Steel Exhaust SGG53V
Model: 3957865
Condition: NEW
$1,205.99 kt
Pypes Cat Back Exhaust System 78-88 GM G-Body Split Rear Dual Exit 3 in Intermediate Pipe And Tailpipe Race Pro Mufflers/Hardware Incl Tip Not Incl Natural 409 Stainless Steel Exhaust SGG51R
Pypes Cat Back Exhaust System 78-88 GM G-Body Split Rear Dual Exit 3 in Intermediate Pipe And Tailpipe Race Pro Mufflers/Hardware Incl Tip Not Incl Natural 409 Stainless Steel Exhaust SGG51R
Model: 3957869
Condition: NEW
$1,338.99 kt
Pypes Crossmember Back w/Xchange Exhaust System 64-74 A-Body Split Rear Dual Exit 3 in Intermediate And Tail Pipe Race Pro Mufflers/Hardware Incl Tip Not Incl 409 Stainless Steel Exhaust SGA14R
Pypes Crossmember Back w/Xchange Exhaust System 64-74 A-Body Split Rear Dual Exit 3 in Intermediate And Tail Pipe Race Pro Mufflers/Hardware Incl Tip Not Incl 409 Stainless Steel Exhaust SGA14R
Model: 3917283
Condition: NEW
$1,627.99 kt