close promo banner icon

header-back

Flowmaster 817390 - American Thunder Header Back Exhaust System

rating-star review rating-star review 1rating-star review 2rating-star review 3rating-star review 4

$805.95

$895.95

You save: $90.00 (10%) off MSRP

stock messaging Out of StockOut of Stock
Order now to be added to the priority list
Check to see if this fits your vehicle

This part fits

  1. 1971 Plymouth Road Runner 5.6L V8 cid:340 cc:5572
  2. 1971 Plymouth Road Runner 7.2L V8 cid:440 cc:7211
  3. 1970 Plymouth Road Runner
  4. 1970 Dodge Charger 5.6L V8 cid:340 cc:5572
  5. 1970 Dodge Charger 5.2L V8 cid:318 cc:5211
  6. 1970 Dodge Coronet 5.2L V8 cid:318 cc:5211
  7. 1970 Dodge Charger 7.2L V8 cid:440 cc:7212
  8. 1970 Plymouth Belvedere 6.3L V8 cid:383
  9. 1970 Plymouth Belvedere 5.2L V8 cid:318 cc:5211
  10. 1970 Dodge Coronet 7.2L V8 cid:440
  11. 1970 Dodge Coronet 7.0L V8 cid:426 cc:6981
  12. 1970 Dodge Coronet 7.0L V8 cid:426
  13. 1970 Dodge Coronet 6.3L V8 cid:383 cc:6286
  14. 1970 Dodge Coronet 6.3L V8 cid:383
  15. 1970 Dodge Coronet 5.6L V8 cid:340 cc:5572
  16. 1970 Dodge Coronet 7.2L V8 cid:440 cc:7212
  17. 1970 Dodge Charger 7.2L V8 cid:440 cc:7211
  18. 1970 Dodge Charger 7.2L V8 cid:440
  19. 1970 Dodge Charger 7.0L V8 cid:426 cc:6981
  20. 1970 Plymouth GTX
  21. 1970 Dodge Charger 7.0L V8 cid:426
  22. 1970 Dodge Charger 6.3L V8 cid:383
  23. 1970 Dodge Charger 6.3L V8 cid:383 cc:6286
  24. 1970 Plymouth Belvedere 6.3L V8 cid:383 cc:6286
  25. 1970 Dodge Coronet 7.2L V8 cid:440 cc:7211
  26. 1969 Plymouth Belvedere 7.0L V8 cid:426 cc:6981
  27. 1969 Plymouth Belvedere 6.3L V8 cid:383 cc:6286
  28. 1969 Plymouth Belvedere 6.3L V8 cid:383
  29. 1969 Dodge Charger 7.0L V8 cid:426 cc:6981
  30. 1969 Dodge Charger 7.0L V8 cid:426
  31. 1969 Dodge Charger 6.3L V8 cid:383 cc:6286
  32. 1969 Dodge Coronet 6.3L V8 cid:383 cc:6286
  33. 1969 Dodge Coronet 6.3L V8 cid:383
  34. 1969 Dodge Coronet 5.2L V8 cid:318 cc:5211
  35. 1969 Dodge Coronet 7.0L V8 cid:426 cc:6981
  36. 1969 Dodge Coronet 7.0L V8 cid:426
  37. 1969 Dodge Charger 7.2L V8 cid:440 cc:7212
  38. 1969 Dodge Charger 5.2L V8 cid:318 cc:5211
  39. 1969 Dodge Charger 7.2L V8 cid:440
  40. 1969 Plymouth Belvedere 5.2L V8 cid:318 cc:5211
  41. 1969 Plymouth GTX
  42. 1969 Plymouth Road Runner
  43. 1969 Plymouth Satellite 5.2L V8 cid:318 cc:5211
  44. 1969 Plymouth Satellite 5.6L V8 cid:340 cc:5572
  45. 1969 Plymouth Satellite 6.3L V8 cid:383
  46. 1969 Plymouth Satellite 6.3L V8 cid:383 cc:6286
  47. 1969 Dodge Coronet 7.2L V8 cid:440 cc:7211
  48. 1969 Dodge Coronet 7.2L V8 cid:440
  49. 1969 Dodge Charger 6.3L V8 cid:383
  50. 1969 Dodge Charger 7.2L V8 cid:440 cc:7211
  51. 1968 Plymouth Satellite 5.2L V8 cid:318 cc:5211
  52. 1968 Dodge Coronet 5.2L V8 cid:318 cc:5211
  53. 1968 Dodge Coronet 6.3L V8 cid:383 cc:6286
  54. 1968 Plymouth Belvedere 5.2L V8 cid:318 cc:5211
  55. 1968 Plymouth Belvedere 6.3L V8 cid:383
  56. 1968 Dodge Charger 7.2L V8 cid:440 cc:7211
  57. 1968 Plymouth Satellite 4.5L V8 cid:273
  58. 1968 Dodge Coronet 7.0L V8 cid:426 cc:6981
  59. 1968 Plymouth Satellite 6.3L V8 cid:383
  60. 1968 Dodge Charger 6.3L V8 cid:383 cc:6286
  61. 1968 Dodge Charger 7.0L V8 cid:426 cc:6981
  62. 1968 Plymouth Belvedere 6.3L V8 cid:383 cc:6286
  63. 1968 Plymouth GTX
  64. 1968 Plymouth Satellite 6.3L V8 cid:383 cc:6286
  65. 1968 Dodge Charger 5.2L V8 cid:318 cc:5211
  66. 1968 Dodge Coronet 4.5L V8 cid:273 cc:4473
  67. 1968 Dodge Coronet 7.2L V8 cid:440 cc:7211
  68. 1968 Plymouth Belvedere 4.5L V8 cid:273
  69. 1968 Plymouth Belvedere 4.5L V8 cid:273 cc:4473
  70. 1968 Plymouth Satellite 4.5L V8 cid:273 cc:4473
  71. 1968 Plymouth Road Runner
  72. show all...
Authorized Dealer

About this product

Part #: 817390

For the person who is looking for a complete Header-back dual exhaust system with a performance sound. This system is mandrel bent for maximum performance and includes specially selected mufflers. American Thunder 2.5 in. systems generally deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. The sound level will depend greatly on the engine and level of modification. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.

More Details

Automotive Item GradeHigh Performance
Exhaust Pipe Wall Max Gauge16
Exhaust SeriesAmerican Thunder
Exhaust TypeDual
Exit PositionDual Rear
Exit StyleStraight
Heat Shield AttachedNo
Inlet Diameter2.500 in.
Inlet Inside Diameter2.500 in.
MaterialStainless Steel
Mount TypeUses New Hangers (Included)
Muffler Count2
Muffler SeriesSuper 40 Series
Outlet Diameter2.500 in.
Outlet Outside Diameter2.500 in.
Single or DualDual
Sound LevelModerate/Aggressive
System TypeHeader Back
Tail Pipe Diameter2.500 in.
Tip Diameter2.500 in.
Tip ShapeRound
Tip TypeStraight Cut
TitleFlowmaster 817390 Header-back System 409S - Dual Rear Exit - American Thunder -Moderate/Aggressive
Tubing Diameter2.500 in.
Additional Documents
  1. Certificate of Originpdf
  2. Installation Instructionspdf
  3. Warrantypdf

See what our community says about flowmaster products

product page reviews icon 0product page reviews icon 1product page reviews icon 2product page reviews icon 3product page reviews icon 4
What made you choose this particular product?
Sound
What were you trying to accomplish by adding this product?
Muscle sound
Was it easy install? Any installation tips that will help others?
Yes
Once you’ve had a chance to use the product, did it meet your expectations?
I think three inch would have a better sound.
View on Julio's build
Sam Jacobson

441

Sam Jacobson
2013 Dodge Dart
product page reviews icon 0product page reviews icon 1product page reviews icon 2product page reviews icon 3product page reviews icon 4
What made you choose this particular product?
I wanted a little more rumble from the car at idle.
What were you trying to accomplish by adding this product?
Have more idle, replaced the Flowmaster dBX muffler for the HP-2 Shorty.
Once you’ve had a chance to use the product, did it meet your expectations?
With resonated tips added at the same time, I have enjoyed the sound of my exhaust more than I ever have! When the car is cold my car's exhaust pops louder than ever and I love it! It is a muffler rated way higher on the Flowmaster exhaust chart!
View on Sam's build
product page reviews icon 0product page reviews icon 1product page reviews icon 2product page reviews icon 3product page reviews icon 4
What made you choose this particular product?
Price
What were you trying to accomplish by adding this product?
Lil more growl
Was it easy install? Any installation tips that will help others?
Professional
Once you’ve had a chance to use the product, did it meet your expectations?
Yes great healthy sound
View on Karl's build
product page reviews icon 0product page reviews icon 1product page reviews icon 2product page reviews icon 3product page reviews icon 4
What made you choose this particular product?
Cheap and effecfive. Won’t wear out.
Is this your first time buying from this brand? Did you consider other brands?
No.
Was it easy to install? Any installation tips that will help others?
Cut out the old, clamped in the new.
Once you've had a chance to use the product, did it meet your expectations?
Works fine. Sounds decent.
View on Mason's build
product page reviews icon 0product page reviews icon 1product page reviews icon 2product page reviews icon 3product page reviews icon 4
What made you choose this particular product?
Performance and sound
What were you trying to accomplish by adding this product?
Power and sound
Once you’ve had a chance to use the product, did it meet your expectations?
Very happy with it. Car is very loud but with a nice deep tone.
View on Dakota's build
California prop 65 warningWARNING: Cancer and Reproductive Harm www.p65warnings.cs.gov

*Some manufacturer restrictions apply.

About Flowmaster

Manufacturer of performance exhaust systems, mufflers, cold air intakes, turbo boost modules, catalytic converters, race mufflers, headers and numerous exhaust accessories for late model cars, trucks, off-road, Jeeps, SUV’s, classic muscle cars, powersports vehicles and more. Flowmaster® gives you lots of exhaust choices with 12 designs of chambered mufflers, 3 styles of our exclusive “laminar-flow” mufflers and a new line of FlowFX “straight-through” performance mufflers, along with 5 sound categories of exhaust systems, giving you the customer, the power to custom tailor the sound of your vehicle whether you prefer mild, moderate or aggressive tones and sound levels.

shipping-worldwide from warehouse

we ship worldwide!

Based in California with 3 warehouses across the country, we’re sending out shipments everyday of the week, even Saturdays. Because your next mod shouldn’t have to wait.

+ FREE GROUND SHIPPING ON U.S. ORDERS OVER $99
Globe international shipping icon
Have a question? Ask an Expert!

Finding the best parts can be tricky

- but not to worry! Our team of experienced American Muscle, JDM, Euro, and off-road tuners are ready to answer your questions (as long as we’re not in the garage wrenching on our own builds).

chat-iconLive Chat
Ask our expert tuners anything!
call_iconCall Us
1 (800) 959-4304
Decorative testimonal quote icon

What do you get when you mix Facebook, Amazon, and your favorite online car forum? You get Wheelwell.com.

undefined supporting their testimonial

Hot Rod Magazine

Decorative testimonal quote icon

Wheelwell helps you organize all your stuff for your car, I’ve loaded all my cars on Wheelwell and you can see all the parts I’ve put in them and that may help you make a decision with your own build.

Matt Farah supporting their testimonial

Matt Farah

The Smoking Tire / The Drive

Decorative testimonal quote icon

This is an awesome new site where enthusiasts can get together and figure out what products work best on their ride.

undefined supporting their testimonial

The Truck Show Podcast