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Flowmaster 817937 American Thunder Crossmember-Back Exhaust System

(1963-1966 Chevrolet C10 Pickup; 1963-1965 GMC 1000 Series Base; 1966 GMC 1000 Base)

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

817937
7 reviews
Sale Price

$949.95

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The Flowmaster 817937 American Thunder Crossmember-Back Exhaust System delivers aggressive muscle truck sound and enhanced performance for both short bed and long bed trucks. This complete exhaust system features Flowmaster's legendary Super 44 Series mufflers that produce a deep, powerful tone that turns heads while maintaining excellent interior comfort.

Key Features:

  • Super 44 Series mufflers deliver deep, classic muscle truck sound with aggressive exterior tone
  • 2.5-inch mandrel bent tubing maximizes exhaust flow for improved horsepower and torque
  • H-pipe style crossover pipe balances exhaust pulses for better performance and reduced cabin drone
  • 409 stainless steel construction provides superior corrosion resistance and long-lasting durability
  • Three exit options included for customizable appearance—choose side exit or rear exit configurations
  • Universal fit for both short bed and long bed truck applications
  • Complete bolt-on system includes all necessary hangers, clamps, and hardware for straightforward installation
  • Backed by Flowmaster's Lifetime Limited Warranty for peace of mind

This American Thunder system is engineered for truck enthusiasts who want maximum sound and performance gains without sacrificing quality or durability. The mandrel bent tubing maintains consistent pipe diameter throughout bends, eliminating restrictions and ensuring optimal exhaust velocity. Professional installation recommended but designed for at-home installation with basic tools.

Products specifications

Fits

1963-1966 Chevrolet C10 Pickup; 1963-1965 GMC 1000 Series Base; 1966 GMC 1000 Base

Prop 65

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

California Proposition 65 Chemical Name

Nickel (Metallic)

California Proposition 65 Chemical Name

Chromium (hexavalent compounds)

Tubing Diameter

2.500 in.

Exhaust Type

Header-Back

Exit Position

Dual Rear

Material

409 Stainless Steel

Brand

Flowmaster

Catalytic Converter Quantity

0

Category

Exhaust

Clamping Type

Flat Band

Clamps Included

Yes

Emission Code

5

Exhaust Series

American Thunder

Exhaust Tip Quantity

0

Exhaust Tip Quantity

Sold Separately

Exhaust Tip Shape

Round

Exit Style

Dual Out Side

Exit Style

Dual Out Rear

Finish

Natural

Gasket Or Seal Included

No

Grade Type

Performance

Hangers Included

Yes

Inlet Type

Clamp-On

Mount Type

Uses Factory Hangers

Mounting Bracket Included

Yes

Muffler (Left) Body Width

9.50

Muffler (Left) Type

Chambered

Muffler (Rear) Type

Chambered

Muffler (Right) Type

Chambered

Muffler Body Length

13.25

Muffler Body Material

409 Stainless Steel

Muffler Body Shape

Oval

Muffler Color

Black

Muffler Finish

Black High-Temperature Paint Finish

Muffler Flanged Inlet

No

Muffler Flanged Outlet

No

Muffler Inlet Connection

Slip-Fit

Muffler Inlet Location

Offset

Muffler Outlet Connection

Slip-Fit

Muffler Outlet Location

Offset

Muffler Outlet Quantity

1

muffler part number

Kit Only

Muffler Quantity

2

Muffler Series

Super 44

Muffler Type

Chambered

Pipe Color

Silver

Pipe Material

409 Stainless Steel

Product Type

Exhaust System

Sound Level

Aggressive / Moderate

Spring Bolt Kit Included

No

Tail Pipe Quantity

Dual

Tail Pipe Quantity

2

Tail Pipe Tapered Outlet

No

Type

Crossmember-Back

Valve Included

No

Valve Type

Not Applicable

Warning

California Proposition 65

Great checkout

amazing came super fast

Fast easy and best price. Free shipping!

quick and easy ordering

It was easy to order and arrived on time

Talked to guy on chat before I ordered. Clint was very helpful!

I found good quality product more cheaper here. I installed the shocks. Did not have any problem.

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