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Product Muffler Series
Original 40 Series
Original 40 Series
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SKU:
43041
Flowmaster 40 Series Chambered Muffler
Delivers the original, aggressive Flowmaster tone inside and out — the classic 40 Series sound
Fully MIG welded 16 gauge aluminized steel construction for maximum durability
High-temperature paint finish stands up to real-world exhaust heat
Universal fitment with a 3.00″ inlet, ideal for street rod and custom builds
Iconic chambered design from the trusted Flowmaster company
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SKU:
8042441
Flowmaster 40 Series Chambered Muffler
Signature Flowmaster 40 Series sound — aggressive tone inside and outside the vehicle
16 gauge 409S stainless steel, fully MIG welded for maximum durability
High-temperature paint finish for lasting protection against heat and the elements
Universal fitment for Truck/SUV builds and custom exhaust systems
2.25″ inlet diameter with a 9.50″ body width in the classic chambered design
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SKU:
8042541
Flowmaster 40 Series Chambered Muffler
Delivers the original, aggressive Flowmaster tone inside and out
16 gauge 409S stainless steel, fully MIG welded for lasting durability
2.50-inch inlet and 9.50-inch body width with universal fitment
High-temperature paint finish stands up to heat and the elements
Chambered 40 Series design ideal for classic muscle car builds
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SKU:
8042543
Flowmaster 40 Series Chambered Muffler
Delivers the original, aggressive Flowmaster tone inside and out for a true muscle car sound
16 gauge 409S stainless steel, fully MIG welded for maximum durability
High-temperature paint finish adds extra heat and corrosion protection
Universal fitment with a 2.50″ inlet and 9.50″ body width for versatile classic muscle car builds
Part of the legendary Original 40 Series chambered design that defined the Flowmaster company
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SKU:
8043043
Flowmaster 40 Series Chambered Muffler
Delivers the original, aggressive Flowmaster 40 Series sound — bold interior and exterior tone
Built from 16 gauge 409S stainless steel and fully MIG welded for maximum durability
3.00″ inlet diameter with a 9.50″ body width for a strong flow foundation
Universal fitment makes it ideal for classic muscle car builds and custom exhaust systems
High-temperature paint finish helps it withstand the heat of hard driving
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SKU:
42541
Flowmaster 40 Series Chambered Muffler
Delivers the original, aggressive Flowmaster tone inside and out
Built from 16 gauge aluminized steel and fully MIG welded for durability
Chambered 40 Series design needs no packing that can burn out
Universal fitment with 2.50″ inlet and compact 19.00″ length for flexible installs
High-temperature paint finish stands up to serious exhaust heat
Ideal foundation for street rod and performance flowmaster exhaust systems
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SKU:
430402
Flowmaster 40 Series Chambered Muffler
Delivers the original, aggressive Flowmaster 40 Series sound inside and out
16 gauge aluminized steel construction, fully MIG welded for maximum durability
High-temperature paint finish for added heat and corrosion protection
3.00″ inlet with dual outlet location and a compact 9.50″ body width
Chambered performance muffler tuned for a bold, race-inspired tone
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SKU:
43043
Flowmaster 40 Series Chambered Muffler
Delivers the original, aggressive Flowmaster 40 Series tone — bold interior and exterior sound
Fully MIG welded 16 gauge aluminized steel construction for maximum durability
High-temperature paint finish stands up to real-world exhaust heat
Universal fitment with a 9.50 body width for versatile custom and Street Rod builds
Iconic chambered design from the Flowmaster company that defined the signature sound
Quick View
Add to wishlist
Add to compare
SKU:
42443
Flowmaster 40 Series Chambered Muffler
Delivers the signature aggressive Flowmaster 40 Series tone, both inside and out
Built from durable 16 gauge aluminized steel and fully MIG welded for strength
High-temperature paint finish stands up to exhaust heat
Universal fitment with a 2.25″ inlet and compact 19.00″ overall length for flexible installs
A proven, iconic choice for street rod and custom exhaust builds
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SKU:
42543
Flowmaster 40 Series Chambered Muffler
Delivers the original, aggressive Flowmaster 40 Series tone inside and out
16 gauge aluminized steel, fully MIG welded for maximum durability
Universal fitment with a 2.50″ inlet and compact 19.00″ length for custom builds
High-temperature paint finish stands up to real exhaust heat
Ideal performance muffler for street rods and custom exhaust systems
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Add to compare
SKU:
425403
Exhaust Muffler
Delivers the original, aggressive Flowmaster tone inside and out
16 gauge aluminized steel, fully MIG welded for maximum durability
High-temperature paint finish built to handle exhaust-system heat
Universal fitment with 2.50-inch dual inlet, ideal for Street Rod and custom builds
Compact 9.50-inch body width fits a wide range of exhaust routing projects
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SKU:
42441
Flowmaster 40 Series Chambered Muffler
Delivers the original, aggressive Flowmaster sound with a proven chambered design
Built from durable 16 gauge aluminized steel and fully MIG welded for maximum durability
Universal fitment with a 2.25″ inlet makes it a versatile choice for street rod and custom builds
High-temperature paint finish helps it stand up to real-world driving
Iconic 40 Series tone — one of the most recognizable performance mufflers on the street
Quick View
Add to wishlist
Add to compare
SKU:
80430402
Flowmaster 40 Series Chambered Muffler
Delivers the original, aggressive Flowmaster sound both inside and outside the cabin
Built from 16 gauge 409S stainless steel and fully MIG welded for maximum durability
High-temperature paint finish adds extra protection against heat and the elements
Universal fitment with a 3.00-inch inlet and dual outlet, ideal for classic muscle car builds
Part of the legendary Original 40 Series that defined the Flowmaster sound
Quick View
Add to wishlist
Add to compare
SKU:
8042443
Flowmaster 40 Series Chambered Muffler
Delivers the original, aggressive Flowmaster tone with a bold interior and exterior sound
Built from 16-gauge 409S stainless steel and fully MIG welded for maximum durability
High-temperature paint finish helps resist harsh under-vehicle heat
Universal fitment designed for Truck/SUV applications with a 2.25″ inlet
Iconic Original 40 Series chambered design — the classic Flowmaster muffler
Quick View
Add to wishlist
Add to compare
SKU:
8043041
Flowmaster 40 Series Chambered Muffler
Delivers the original aggressive Flowmaster sound, inside and out
Constructed of 16 gauge 409S stainless steel, fully MIG welded for maximum durability
3.00″ inlet with a 9.50″ body width for versatile builds
Universal fitment ideal for Truck/SUV applications
High-temperature paint finish stands up to exhaust heat
Part of the proven Original 40 Series chambered muffler lineup
Quick View
Add to wishlist
Add to compare
SKU:
42542
Exhaust Muffler
Delivers the original Flowmaster sound with an aggressive interior and exterior tone
Built from 16 gauge aluminized steel and fully MIG welded for maximum durability
High-temperature paint finish stands up to real exhaust heat
Universal fitment with a 2.50″ inlet and compact 19.00″ length for flexible installs
Ideal building block for a street rod exhaust system or custom cat back setup
Quick View
Add to wishlist
Add to compare
SKU:
42442
Flowmaster 40 Series Chambered Muffler
Delivers the classic, aggressive Flowmaster tone inside and out — the Original 40 Series sound
16 gauge aluminized steel, fully MIG welded for maximum durability
High-temperature paint finish built to withstand exhaust heat
Universal fitment with a 2.25″ inlet — ideal for street rod and custom builds
Proven chambered performance muffler design from the Original 40 Series
Quick View
Add to wishlist
Add to compare
SKU:
425404
Exhaust Muffler
Delivers the iconic aggressive Flowmaster tone inside and out
16 gauge aluminized steel, fully MIG welded for maximum durability
High-temperature paint finish stands up to exhaust heat
Universal fitment with 2.50″ dual inlet and dual outlet for flexible builds
Ideal aggressive muffler for street rod and custom exhaust systems
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1962
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1960
1959
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1957
1956
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1954
1953
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1951
1950
1949
1948
1947
1946
Select Brand
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Select Engine