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Flowmaster 817585 - American Thunder Header Back Exhaust System

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$968.95

$1,077.00

You save: $108.05 (10%) off MSRP

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  1. 1974 Plymouth Valiant 5.9L V8 cid:360
  2. 1974 Plymouth Valiant 5.2L V8 cid:318 cc:5211
  3. 1974 Dodge Dart 5.9L V8 cid:360
  4. 1974 Dodge Dart 5.2L V8 cid:318 cc:5211
  5. 1974 Plymouth Duster 5.2L V8 cid:318 cc:5211
  6. 1974 Plymouth Duster 5.9L V8 cid:360
  7. 1973 Dodge Dart 5.6L V8 cid:340 cc:5572
  8. 1973 Dodge Dart 5.2L V8 cid:318 cc:5211
  9. 1973 Plymouth Valiant 5.6L V8 cid:340 cc:5572
  10. 1973 Dodge Dart 5.9L V8 cid:360
  11. 1973 Plymouth Valiant 5.2L V8 cid:318 cc:5211
  12. 1973 Plymouth Duster 5.6L V8 cid:340 cc:5572
  13. 1973 Plymouth Duster 5.6L V8 cid:340
  14. 1973 Plymouth Duster 5.2L V8 cid:318 cc:5211
  15. 1973 Dodge Dart 5.6L V8 cid:340
  16. 1973 Plymouth Valiant 5.9L V8 cid:360
  17. 1972 Dodge Dart 5.9L V8 cid:360
  18. 1972 Dodge Dart 5.2L V8 cid:318 cc:5211
  19. 1972 Plymouth Duster 5.6L V8 cid:340
  20. 1972 Plymouth Valiant 5.9L V8 cid:360
  21. 1972 Dodge Dart 5.6L V8 cid:340 cc:5572
  22. 1972 Plymouth Valiant 5.6L V8 cid:340 cc:5572
  23. 1972 Plymouth Duster 5.2L V8 cid:318 cc:5211
  24. 1972 Plymouth Valiant 5.2L V8 cid:318 cc:5211
  25. 1972 Plymouth Duster 5.6L V8 cid:340 cc:5572
  26. 1972 Dodge Dart 5.6L V8 cid:340
  27. 1971 Plymouth Valiant 5.2L V8 cid:318 cc:5211
  28. 1971 Dodge Dart 5.6L V8 cid:340
  29. 1971 Plymouth Valiant 5.9L V8 cid:360
  30. 1971 Plymouth Duster 5.6L V8 cid:340 cc:5572
  31. 1971 Dodge Dart 5.6L V8 cid:340 cc:5572
  32. 1971 Dodge Dart 5.9L V8 cid:360
  33. 1971 Plymouth Duster 5.2L V8 cid:318 cc:5211
  34. 1971 Dodge Dart 5.2L V8 cid:318 cc:5211
  35. 1971 Plymouth Duster 5.6L V8 cid:340
  36. 1971 Plymouth Valiant 5.6L V8 cid:340 cc:5572
  37. 1970 Plymouth Valiant 5.6L V8 cid:340 cc:5572
  38. 1970 Dodge Dart Swinger 5.6L V8 cid:340
  39. 1970 Dodge Dart Swinger 5.6L V8 cid:340 cc:5572
  40. 1970 Plymouth Duster 5.2L V8 cid:318 cc:5211
  41. 1970 Plymouth Duster 5.6L V8 cid:340
  42. 1970 Plymouth Valiant 5.2L V8 cid:318 cc:5211
  43. 1970 Dodge Dart Swinger 5.2L V8 cid:318 cc:5211
  44. 1970 Dodge Dart Custom 5.6L V8 cid:340 cc:5572
  45. 1970 Dodge Dart Base 5.2L V8 cid:318 cc:5211
  46. 1970 Dodge Dart Custom 5.2L V8 cid:318 cc:5211
  47. 1970 Dodge Dart Base 5.6L V8 cid:340 cc:5572
  48. 1970 Plymouth Duster 5.6L V8 cid:340 cc:5572
  49. 1970 Dodge Dart Base 5.6L V8 cid:340
  50. 1969 Dodge Dart GTS 5.2L V8 cid:318 cc:5211
  51. 1969 Dodge Dart Swinger 4.5L V8 cid:273
  52. 1969 Dodge Dart Custom 4.5L V8 cid:273
  53. 1969 Dodge Dart Swinger 4.5L V8 cid:273 cc:4473
  54. 1969 Dodge Dart Swinger 5.2L V8 cid:318 cc:5211
  55. 1969 Dodge Dart Swinger 5.6L V8 cid:340
  56. 1969 Dodge Dart GT 5.6L V8 cid:340
  57. 1969 Dodge Dart GT 5.6L V8 cid:340 cc:5572
  58. 1969 Dodge Dart GTS 4.5L V8 cid:273
  59. 1969 Dodge Dart Base 4.5L V8 cid:273
  60. 1969 Dodge Dart Base 4.5L V8 cid:273 cc:4473
  61. 1969 Dodge Dart Custom 4.5L V8 cid:273 cc:4473
  62. 1969 Dodge Dart Custom 5.2L V8 cid:318 cc:5211
  63. 1969 Dodge Dart Custom 5.6L V8 cid:340 cc:5572
  64. 1969 Dodge Dart GTS 4.5L V8 cid:273 cc:4473
  65. 1969 Dodge Dart Base 5.6L V8 cid:340 cc:5572
  66. 1969 Dodge Dart GTS 5.6L V8 cid:340
  67. 1969 Dodge Dart GTS 5.6L V8 cid:340 cc:5572
  68. 1969 Dodge Dart Base 5.2L V8 cid:318 cc:5211
  69. 1969 Plymouth Valiant 100 4.5L V8 cid:273 cc:4473
  70. 1969 Dodge Dart Swinger 5.6L V8 cid:340 cc:5572
  71. 1969 Plymouth Valiant 100 4.5L V8 cid:273
  72. 1969 Plymouth Valiant 100 5.2L V8 cid:318 cc:5211
  73. 1969 Plymouth Valiant 100 5.6L V8 cid:340 cc:5572
  74. 1969 Dodge Dart GT 4.5L V8 cid:273 cc:4473
  75. 1969 Dodge Dart GT 5.2L V8 cid:318 cc:5211
  76. 1969 Dodge Dart GT 4.5L V8 cid:273
  77. 1969 Plymouth Valiant Signet 4.5L V8 cid:273
  78. 1969 Plymouth Valiant Signet 4.5L V8 cid:273 cc:4473
  79. 1969 Plymouth Valiant Signet 5.2L V8 cid:318 cc:5211
  80. 1969 Plymouth Valiant Signet 5.6L V8 cid:340 cc:5572
  81. 1968 Plymouth Valiant Signet 5.6L V8 cid:340 cc:5572
  82. 1968 Plymouth Valiant Signet 4.5L V8 cid:273
  83. 1968 Plymouth Valiant Signet 4.5L V8 cid:273 cc:4473
  84. 1968 Plymouth Valiant Signet 5.2L V8 cid:318 cc:5211
  85. 1968 Dodge Dart 5.6L V8 cid:340 cc:5572
  86. 1968 Plymouth Valiant 100 4.5L V8 cid:273
  87. 1968 Plymouth Valiant 100 5.2L V8 cid:318 cc:5211
  88. 1968 Dodge Dart 4.5L V8 cid:273
  89. 1968 Dodge Dart 4.5L V8 cid:273 cc:4473
  90. 1968 Plymouth Valiant 100 5.6L V8 cid:340 cc:5572
  91. 1968 Dodge Dart 5.6L V8 cid:340
  92. 1968 Dodge Dart 5.2L V8 cid:318 cc:5211
  93. 1968 Plymouth Valiant 100 4.5L V8 cid:273 cc:4473
  94. 1967 Plymouth Valiant 4.5L V8 cid:273
  95. 1967 Plymouth Valiant 4.5L V8 cid:273 cc:4473
  96. show all...
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About this product

Part #: 817585

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 SeriesAmerican Thunder
Exhaust TypeDual
Exit PositionDual Rear
Exit StyleStraight
Heat Shield AttachedNo
Inlet Diameter2.500 in.
Inlet Inside Diameter2.500 in.
MaterialStainless Steel
Muffler Count2
Muffler Part NumberKit Only
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 Quantity0
TitleFlowmaster 817585 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?
was already on car but is alright for what it is
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?
Was welded on when got just take exhaust to shops they can weld better than you.
Once you've had a chance to use the product, did it meet your expectations?
Its fine but I wish it was a bit louder
Any additional comments?
buy corsa
View on Chance'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?
I didnt want it to be obnoxious because It was my daily. Sounds good.
Is this your first time buying from this brand? Did you consider other brands?
Yes, Flowmaster is high quality. I did consider the 40 series.
View on Sergio'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?
I was looking for a certain sound, and this delivered!
Is this your first time buying from this brand? Did you consider other brands?
Yes, first time.
View on Logan'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?
it was a gift for high school graduation from my uncle, i've been wanting a flowmaster for quite some time, so finally having one made me happy.
Is this your first time buying from this brand? Did you consider other brands?
yes, having never put an exhaust on any car that i or my family has owned, flowmaster had the best sound to make my 4.0 more noisy without being obnoxious
Was it easy to install? Any installation tips that will help others?
did require cutting and welding
View on Jordan'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?
I already had the Flowmaster Axle Back to go with it.
Is this your first time buying from this brand? Did you consider other brands?
I have other parts from Flowmaster.
View on Matt'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.

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