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Home / Exhaust / Catback / Flowmaster 63-66 GM C10 American Thunder SS Crossmember-Back Exhaust System
Flowmaster 63-66 GM C10 American Thunder SS Crossmember-Back Exhaust System
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Flowmaster

Flowmaster 63-66 GM C10 American Thunder SS Crossmember-Back Exhaust System

PART 817937CATEGORY Catback
$949.95
MSRP $1,068.95You save $119.00
$949.95
1

Product information

Manufacturer information. Check the part number and installation requirements for your vehicle.

Supplier details checked 2026-09-23 · Test catalog

Product description

Fits 1963-1966 GM C10/1000 Series V8 Truck, 2WD Short and Long Bed, 2.5" 409 Stainless Steel, Dual Exit

Flowmaster American Thunder Crossmember-Back Exhaust System

Features

H-Pipe Style Crossover Pipe Improves Performance and Reduces Interior Sound

2.5-Inch Mandrel Bent Tubing Improves Exhaust Flow for Better Performance

409 Stainless Steel Construction adds Corrosion Resistance and Durability

Includes all Necessary Hangers and Hardware for an at Home Installation

Super 44 Series Mufflers Give You a Deep, Classic Muscle Truck Sound

3 Exit Options Allow You to Customize the Look of Your Truck

Backed by Flowmaster’s Lifetime Limited Warranty

Fits both Short Bed and Long Bed Trucks

Manufacturer notes

Fits Both Long And Short Wheelbases Does Not Fit Trucks with Torsion Bar Front Suspension or X-Frames

Supplier category
Exhaust, Mufflers & Tips
Supplier subcategory
Catback
UPC / barcode
090127100523
Units per product
1
Supplier Proposition 65 status
Y
Supplier EPA status
N/A
Air freight prohibited
No
Not CARB approved
No
CARB acknowledgement required
Yes
Freight delivery required
No
Powersports product
No
More manufacturer information

Other product descriptions

Flowmaster 63-66 GM C10 American Thunder SS Crossmember-Back Exhaust System

6366 GM C10 XMEMBER BACK AMT 409S

SYS 63-66 GM C10 X-M

About the manufacturer

This American Thunder exhaust system is specifically designed for 1963-1966 Chevrolet C10 and GMC 1000 series 2-wheel drive, non X-Frame V8 trucks without the torsion bar front suspension. The system is perfect for the person looking for an aggressive to moderate exterior and interior sound level. Starting just after factory manifold downpipes or a set of headers, this exhaust system comes complete with a built-in H-pipe crossover and all mandrel bent 2.50-inch 409 stainless steel tubing that helps maximize the flow of the exhaust pulses for better performance and the added durability of stainless steel. The Super 44 Series performance mufflers will give any V8 a deep rumble with that classic Flowmaster tone. This system comes with your choice of three tailpipe exits, straight out the rear, side exit behind each rear tire, or dumped behind the rear tires. The system includes all hardware necessary for an at home installation. This exhaust system is covered by our Lifetime Limited Warranty. Fits both short and long wheelbase trucks.

Additional manufacturer information

SYS 63-66 GM

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