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Flowmaster 817281 American Thunder Crossmember-Back Dual Exhaust System

(1967-1970 Ford Mustang)

Part of: Flowmaster American Thunder Crossmember-Back Dual Exhaust System

Other options in this family: Flowmaster 817654 Flowmaster 17201 Flowmaster 817200 Flowmaster 817174 Flowmaster 17282

Manufacturer

Picture for manufacturer Flowmaster

Part Number

817281
18 reviews
Sale Price

$999.95

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The Flowmaster American Thunder Crossmember-Back Exhaust System delivers aggressive sound and performance gains for muscle car and truck enthusiasts. This true dual exhaust system features Flowmaster's legendary Super 44 Series mufflers, engineered to produce a deep, powerful exhaust note with an aggressive to moderate exterior tone.

Key Features:

  • Super 44 Series performance mufflers for maximum sound and flow
  • H-pipe crossover design balances exhaust pulses for optimized power delivery
  • True dual crossmember-back configuration for reduced backpressure
  • 3-inch polished 304 stainless steel tips for corrosion resistance and show-quality appearance
  • Complete hardware kit includes hangers and all necessary installation components
  • Backed by Flowmaster's Lifetime Limited Warranty

This system is designed for bolt-on installation from the crossmember back, replacing restrictive factory exhaust components. Note that header reducers and downpipes for factory manifolds are not included and must be sourced separately if needed. The aggressive exhaust tone provides that classic muscle car rumble while maintaining street-friendly sound levels.

Products specifications

Fits

1967-1970 Ford Mustang

Inlet Inside Diameter

2.500 in.

Outlet Outside Diameter

2.500 in.

Tip Diameter

3.000 in.

Prop 65

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

California Proposition 65 Chemical Name 2

Chromium (hexavalent compounds)

California Proposition 65 Chemical Name 1

Nickel (metallic)

California Proposition 65 Chemical Name

Chromium (hexavalent compounds)

California Proposition 65 Chemical Name

Nickel (Metallic)

System Type

Header Back

Heat Shield Attached

No

Material

Stainless Steel

Tubing Diameter

2.500 in.

Outlet Diameter

2.500 in.

Muffler Count

2

Exit Position

Dual Rear

Tip Quantity

2

Tail Pipe Diameter

2.500 in.

Exhaust Type

Dual

Single or Dual

Dual

Title

Flowmaster 817281 Header-back System 409S - Dual Rear Exit - American Thunder - Aggressive Sound

Brand

Flowmaster

Catalytic Converter Quantity

0

Category

Exhaust

Clamping Type

Flat Band

Clamps Included

Yes

Drive

2WD

Emission Code

5

Exhaust Series

American Thunder

Exhaust Tip Color

Silver

Exhaust Tip Connection

Clamp-On

Exhaust Tip Cut

Angled

Exhaust Tip Edge

Rolled Edge Angle Cut

Exhaust Tip Finish

Polished

Exhaust Tip Intercooled

No

Exhaust Tip Material

304 Stainless Steel

Exhaust Tip Quantity

2

Exhaust Tip Resonated

No

Exhaust Tip Shape

Round

Exhaust Tip Wall

Single Wall

Exit Style

Dual Out Rear

Finish

Natural

Gasket Or Seal Included

No

Grade Type

Performance

Hangers Included

Yes

Heat Shield Included

No

Inlet Diameter

2.50

Inlet Type

Weld-On

Mounting Bracket Included

Yes

Muffler (Left) Type

Chambered

Muffler (Right) Type

Chambered

Muffler Body Material

409 Stainless Steel

Muffler Body Shape

Oval

Muffler Finish

Black High-Temperature Paint Finish

Muffler Flanged Inlet

No

Muffler Flanged Outlet

No

Muffler Inlet Connection

Slip-Fit

Muffler Outlet Connection

Slip-Fit

Muffler Outlet Quantity

1

muffler part number

Kit Only

Muffler Quantity

2

Muffler Series

Super 44 Series

Muffler Type

Chambered

Pipe Color

Silver

Pipe Material

409 Stainless Steel

Product Type

Exhaust System

Sound Level

Aggressive / Moderate

Spring Bolt Kit Included

No

Sub Category

Exhaust and Tail Pipes

Tail Pipe Quantity

2

Tail Pipe Quantity

Dual

Tail Pipe Tapered Outlet

No

Type

Crossmember-Back

Valve Included

No

Valve Type

Not Applicable

Warning

California Proposition 65

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