My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Flowmaster 817390 American Thunder Crossmember-Back Dual Exhaust System

(1968-1970 Dodge Charger; 1968-1970 Dodge Coronet; 1968-1971 Plymouth Road Runner; 1968-1970 Plymouth GTX; 1968-1970 Plymouth Satellite + 1 more model)

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

817390
13 reviews
Sale Price

$1,117.95

In Stock (10+)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Flowmaster American Thunder Crossmember-Back Exhaust System delivers aggressive sound and improved performance for your vehicle. This true dual exhaust system features premium mandrel-bent construction that maximizes exhaust flow while maintaining consistent pipe diameter throughout.

Key Features:

  • True dual exhaust design with crossmember-back configuration
  • Mandrel-bent 16-gauge stainless steel tubing for durability and corrosion resistance
  • Super 40 Series mufflers produce Flowmaster's signature deep, powerful exhaust tone
  • H-pipe crossover balances exhaust pulses for maximum power and enhanced sound quality
  • Complete hardware kit includes all necessary hangers and mounting hardware
  • Backed by Flowmaster's Lifetime Limited Warranty

This bolt-on system is engineered for straightforward installation and delivers the aggressive Flowmaster sound enthusiasts demand. The stainless steel construction ensures long-lasting performance and resistance to rust and corrosion. Note that header reducers and downpipes for factory manifolds are not included and must be purchased separately if needed.

Products specifications

Fits

1968-1970 Dodge Charger; 1968-1970 Dodge Coronet; 1968-1971 Plymouth Road Runner; 1968-1970 Plymouth GTX; 1968-1970 Plymouth Satellite; 1968-1970 Plymouth Belvedere

Tip Shape

Round

Tip Diameter

2.500 in.

Inlet Inside Diameter

2.500 in.

Outlet Outside Diameter

2.500 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

Nickel (Metallic)

California Proposition 65 Chemical Name

Chromium (hexavalent compounds)

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

Tail Pipe Diameter

2.500 in.

Exhaust Type

Dual

Automotive Item Grade

High Performance

Single or Dual

Dual

Tip Type

Straight Cut

Exhaust Pipe Wall Max Gauge

16

Title

Flowmaster 817390 Header-back System 409S - Dual Rear Exit - American Thunder -Moderate/Aggressive

Brand

Flowmaster

Catalytic Converter Quantity

0

Category

Exhaust

Clamping Type

Flat Band

Clamps Included

Yes

Drive

2WD

Emission Code

5

Exhaust Pipe Wall Maximum Gauge

16

Exhaust Series

American Thunder

Exhaust Tip Connection

Clamp-On

Exhaust Tip Quantity

Sold Separately

Exhaust Tip Quantity

0

Exhaust Tip Shape

Round

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

Mount Type

Uses New Hangers (Included)

Mounting Bracket Included

Yes

Muffler (Left) Body Width

10.00

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 Quantity

2

Muffler Series

Super 40 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

Dual

Tail Pipe Quantity

2

Tail Pipe Tapered Outlet

No

Type

Crossmember-Back

Valve Included

No

Valve Type

Not Applicable

Warning

California Proposition 65

Part was only available at Autoplicity, shipping was super quick will do business with them again.

needed a delivery date couldn't confirm

quick

Great prices and delivery as stated.

Would do business with again. Thanks!

Really impressed with speedy order to customer service,also some of the best savings online.Ordered parts late Monday, got the parts wednesday afternoon, combined savings of about $20.00 over nearest low price online. Thanks for the savings, will be ordering from you soon.

Fast and easy

They had the best price I could find, anywhere, for Royal Purple HPS oil (and I spent hours searching). I ordered a case on Sunday night and it arrived on Wednesday (standard shipping) from half-way across the country. For standard shipping, that's pretty fast. They must have send it out early Monday morning, at the latest.<br><br>I'm very satisfied with my experience, and I'll definitely be ordering from them again, when I need another case of oil.

The item was perfect just like from the store and shipped berry fast!!<br><br>Lower price than eBay or Amazon. <br><br>Will recommend to friends.

cheapest price

Your site looks professionally constructed and has an easy to understand interface.

Please for this item, specify that it is only 1 single shock, I was confused. But that yall!

Quick, Friendly & Easy site to use. Would use them again.

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy