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Flowmaster 817409 - American Thunder Header Back Exhaust System

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$622.95

$692.95

You save: $70.00 (10%) off MSRP

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  1. 1973 Pontiac LeMans Safari 5.7L V8 cid:350 cc:5733
  2. 1972 Pontiac LeMans 7.5L V8 cid:455 cc:7457
  3. 1972 Pontiac LeMans 7.5L V8 cid:455
  4. 1972 Pontiac GTO 6.6L V8 cid:400
  5. 1972 Pontiac Grand Prix
  6. 1972 Oldsmobile Vista Cruiser
  7. 1972 Pontiac LeMans 6.6L V8 cid:400 cc:6555
  8. 1972 Pontiac LeMans 6.6L V8 cid:400
  9. 1972 Pontiac LeMans 5.7L V8 cid:350 cc:5733
  10. 1972 Pontiac LeMans 5.7L V8 cid:350
  11. 1972 Pontiac GTO 7.5L V8 cid:455 cc:7456
  12. 1972 Pontiac GTO 7.5L V8 cid:455
  13. 1972 Pontiac GTO 6.6L V8 cid:400 cc:6555
  14. 1972 Oldsmobile F85
  15. 1972 Chevrolet Chevelle SS 6.6L V8 cid:402 cc:6588
  16. 1972 Chevrolet Chevelle SS 6.6L V8 cid:400
  17. 1972 Chevrolet Chevelle Malibu 7.4L V8 cid:454 cc:7441
  18. 1972 Chevrolet Chevelle Malibu 7.4L V8 cid:454 cc:7439
  19. 1972 Chevrolet Chevelle Malibu 7.4L V8 cid:454
  20. 1972 Pontiac LeMans 7.5L V8 cid:455 cc:7456
  21. 1972 Chevrolet Chevelle Malibu 6.6L V8 cid:400
  22. 1972 Chevrolet Chevelle Malibu 5.7L V8 cid:350
  23. 1972 Chevrolet Chevelle Malibu 5.0L V8 cid:307 cc:5031
  24. 1972 Chevrolet Chevelle Base 7.4L V8 cid:454
  25. 1972 Chevrolet Chevelle Malibu 5.0L V8 cid:307
  26. 1972 Chevrolet Chevelle Base 7.4L V8 cid:454 cc:7441
  27. 1972 Chevrolet Chevelle Base 7.4L V8 cid:454 cc:7439
  28. 1972 Chevrolet Chevelle Base 6.6L V8 cid:402 cc:6588
  29. 1972 Chevrolet Chevelle Base 6.6L V8 cid:400
  30. 1972 Chevrolet Chevelle Base 5.7L V8 cid:350
  31. 1972 Chevrolet Chevelle Base 5.0L V8 cid:307 cc:5031
  32. 1972 Chevrolet Chevelle Base 5.0L V8 cid:307
  33. 1972 Buick Skylark Custom 5.7L V8 cid:350
  34. 1972 Buick Skylark Base 5.7L V8 cid:350
  35. 1972 Buick Skylark 350 5.7L V8 cid:350
  36. 1972 Buick GS 455 7.5L V8 cid:455 cc:7456
  37. 1972 Buick GS 455 7.5L V8 cid:455
  38. 1972 Buick GS 5.7L V8 cid:350
  39. 1972 Chevrolet Chevelle Malibu 6.6L V8 cid:402 cc:6588
  40. 1971 Pontiac LeMans T37 5.7L V8 cid:350 cc:5733
  41. 1971 Pontiac LeMans Sport 6.6L V8 cid:400 cc:6555
  42. 1971 Pontiac LeMans Sport 6.6L V8 cid:400
  43. 1971 Pontiac LeMans Sport 5.7L V8 cid:350 cc:5733
  44. 1971 Chevrolet Chevelle SS 6.6L V8 cid:402 cc:6588
  45. 1971 Pontiac LeMans Base 7.5L V8 cid:455 cc:7456
  46. 1971 Pontiac LeMans Base 7.5L V8 cid:455
  47. 1971 Pontiac LeMans Base 6.6L V8 cid:400 cc:6555
  48. 1971 Pontiac LeMans Base 6.6L V8 cid:400
  49. 1971 Pontiac LeMans Base 5.7L V8 cid:350 cc:5733
  50. 1971 Pontiac LeMans T37 5.7L V8 cid:350
  51. 1971 Pontiac LeMans Sport 7.5L V8 cid:455 cc:7456
  52. 1971 Pontiac LeMans Sport 7.5L V8 cid:455
  53. 1971 Pontiac GTO 6.6L V8 cid:400 cc:6555
  54. 1971 Chevrolet Chevelle Malibu 6.6L V8 cid:402 cc:6588
  55. 1971 Pontiac GTO 6.6L V8 cid:400
  56. 1971 Pontiac Grand Prix
  57. 1971 Oldsmobile Vista Cruiser
  58. 1971 Oldsmobile F85 5.7L V8 cid:350
  59. 1971 Oldsmobile 442 7.5L V8 cid:455 cc:7456
  60. 1971 Oldsmobile 442 7.5L V8 cid:455
  61. 1971 Buick GS 5.7L V8 cid:350
  62. 1971 Buick GS 455 7.5L V8 cid:455
  63. 1971 Buick GS 455 7.5L V8 cid:455 cc:7456
  64. 1971 Buick Skylark Base 5.7L V8 cid:350
  65. 1971 Buick Skylark Base 7.5L V8 cid:455
  66. 1971 Buick Skylark Base 7.5L V8 cid:455 cc:7456
  67. 1971 Buick Skylark Custom 5.7L V8 cid:350
  68. 1971 Buick Skylark Custom 7.5L V8 cid:455 cc:7456
  69. 1971 Chevrolet Chevelle Base 5.0L V8 cid:307
  70. 1971 Chevrolet Chevelle Base 5.0L V8 cid:307 cc:5031
  71. 1971 Chevrolet Chevelle Base 5.7L V8 cid:350
  72. 1971 Chevrolet Chevelle Base 7.4L V8 cid:454
  73. 1971 Chevrolet Chevelle Base 7.4L V8 cid:454 cc:7439
  74. 1971 Chevrolet Chevelle Base 7.4L V8 cid:454 cc:7441
  75. 1971 Chevrolet Chevelle Malibu 5.0L V8 cid:307
  76. 1971 Chevrolet Chevelle Malibu 5.0L V8 cid:307 cc:5031
  77. 1971 Chevrolet Chevelle Malibu 5.7L V8 cid:350
  78. 1971 Chevrolet Chevelle Malibu 6.6L V8 cid:400
  79. 1971 Buick Skylark Custom 7.5L V8 cid:455
  80. 1971 Pontiac GTO 7.5L V8 cid:455
  81. 1971 Pontiac GTO 7.5L V8 cid:455 cc:7456
  82. 1971 Pontiac LeMans Base 5.7L V8 cid:350
  83. 1971 Chevrolet Chevelle Malibu 7.4L V8 cid:454
  84. 1971 Chevrolet Chevelle Malibu 7.4L V8 cid:454 cc:7439
  85. 1971 Chevrolet Chevelle Malibu 7.4L V8 cid:454 cc:7441
  86. 1971 Chevrolet Chevelle SS 6.6L V8 cid:400
  87. 1971 Pontiac LeMans Sport 5.7L V8 cid:350
  88. 1970 Oldsmobile Vista Cruiser
  89. 1970 Pontiac Grand Prix
  90. 1970 Pontiac GTO 6.6L V8 cid:400
  91. 1970 Pontiac GTO 6.6L V8 cid:400 cc:6555
  92. 1970 Pontiac GTO 7.5L V8 cid:455
  93. 1970 Pontiac GTO 7.5L V8 cid:455 cc:7456
  94. 1970 Pontiac LeMans Base 5.7L V8 cid:350
  95. 1970 Pontiac LeMans Base 5.7L V8 cid:350 cc:5733
  96. 1970 Oldsmobile 442 7.5L V8 cid:455 cc:7456
  97. 1970 Pontiac LeMans Base 6.6L V8 cid:400 cc:6555
  98. 1970 Pontiac LeMans Base 7.5L V8 cid:455
  99. 1970 Pontiac LeMans Base 7.5L V8 cid:455 cc:7456
  100. 1970 Pontiac LeMans Safari 5.7L V8 cid:350
  101. 1970 Chevrolet Chevelle Base 5.0L V8 cid:307
  102. 1970 Pontiac LeMans Safari 6.6L V8 cid:400
  103. 1970 Pontiac LeMans Safari 6.6L V8 cid:400 cc:6555
  104. 1970 Pontiac LeMans Safari 7.5L V8 cid:455
  105. 1970 Pontiac LeMans Safari 7.5L V8 cid:455 cc:7456
  106. 1970 Pontiac LeMans Sport 5.7L V8 cid:350
  107. 1970 Pontiac LeMans Sport 5.7L V8 cid:350 cc:5733
  108. 1970 Pontiac LeMans Base 6.6L V8 cid:400
  109. 1970 Pontiac LeMans Sport 6.6L V8 cid:400 cc:6555
  110. 1970 Pontiac LeMans Sport 7.5L V8 cid:455
  111. 1970 Pontiac LeMans Sport 7.5L V8 cid:455 cc:7456
  112. 1970 Pontiac Tempest Base 5.7L V8 cid:350 cc:5733
  113. 1970 Chevrolet Chevelle Base 5.7L V8 cid:350
  114. 1970 Chevrolet Chevelle Base 6.6L V8 cid:400
  115. 1970 Buick GS 5.7L V8 cid:350
  116. 1970 Buick GS 455 7.5L V8 cid:455
  117. 1970 Buick GS 455 7.5L V8 cid:455 cc:7456
  118. 1970 Buick Skylark 350 5.7L V8 cid:350
  119. 1970 Buick Skylark Base 5.7L V8 cid:350
  120. 1970 Pontiac LeMans Sport 6.6L V8 cid:400
  121. 1970 Buick Skylark Base 7.5L V8 cid:455 cc:7456
  122. 1970 Buick Skylark Custom 5.7L V8 cid:350
  123. 1970 Buick Skylark Custom 7.5L V8 cid:455
  124. 1970 Buick Skylark Custom 7.5L V8 cid:455 cc:7456
  125. 1970 Chevrolet Chevelle Base 5.0L V8 cid:307 cc:5031
  126. 1970 Chevrolet Chevelle Malibu 5.0L V8 cid:307
  127. 1970 Chevrolet Chevelle Malibu 5.0L V8 cid:307 cc:5031
  128. 1970 Chevrolet Chevelle Malibu 5.7L V8 cid:350
  129. 1970 Chevrolet Chevelle Malibu 6.5L V8 cid:396
  130. 1970 Chevrolet Chevelle Malibu 6.6L V8 cid:400
  131. 1970 Chevrolet Chevelle Malibu 6.6L V8 cid:402 cc:6588
  132. 1970 Chevrolet Chevelle Malibu 7.4L V8 cid:454
  133. 1970 Chevrolet Chevelle Malibu 7.4L V8 cid:454 cc:7439
  134. 1970 Chevrolet Chevelle Malibu 7.4L V8 cid:454 cc:7441
  135. 1970 Chevrolet Chevelle SS 6.5L V8 cid:396
  136. 1970 Oldsmobile 442 7.5L V8 cid:455
  137. 1970 Chevrolet Chevelle Base 6.6L V8 cid:402 cc:6588
  138. 1970 Oldsmobile F85 5.7L V8 cid:350
  139. 1970 Oldsmobile F85 7.5L V8 cid:455
  140. 1970 Oldsmobile F85 7.5L V8 cid:455 cc:7456
  141. 1970 Pontiac LeMans Safari 5.7L V8 cid:350 cc:5733
  142. 1969 Pontiac LeMans 6.6L V8 cid:400
  143. 1969 Pontiac LeMans 6.6L V8 cid:400 cc:6555
  144. 1969 Pontiac LeMans 5.7L V8 cid:350 cc:5733
  145. 1969 Pontiac LeMans 5.7L V8 cid:350
  146. 1969 Pontiac GTO 6.6L V8 cid:400 cc:6555
  147. 1969 Pontiac GTO 6.6L V8 cid:400
  148. 1969 Oldsmobile 442 7.5L V8 cid:455
  149. 1969 Pontiac Grand Prix 7.0L V8 cid:428 cc:7014
  150. 1969 Pontiac Grand Prix 7.0L V8 cid:428
  151. 1969 Pontiac Grand Prix 6.6L V8 cid:400 cc:6555
  152. 1969 Pontiac Grand Prix 6.6L V8 cid:400
  153. 1969 Oldsmobile Vista Cruiser
  154. 1969 Oldsmobile F85 5.7L V8 cid:350
  155. 1969 Oldsmobile 442 7.5L V8 cid:455 cc:7456
  156. 1969 Buick GS 400 6.6L V8 cid:400 cc:6555
  157. 1969 Oldsmobile 442 6.6L V8 cid:400 cc:6555
  158. 1969 Oldsmobile 442 6.6L V8 cid:400
  159. 1969 Chevrolet Chevelle SS 6.5L V8 cid:396 cc:6489
  160. 1969 Chevrolet Chevelle SS 6.5L V8 cid:396
  161. 1969 Chevrolet Chevelle Malibu 6.5L V8 cid:396 cc:6489
  162. 1969 Chevrolet Chevelle Malibu 6.5L V8 cid:396
  163. 1969 Chevrolet Chevelle Malibu 5.7L V8 cid:350
  164. 1969 Chevrolet Chevelle Malibu 5.0L V8 cid:307 cc:5031
  165. 1969 Buick GS 400 6.6L V8 cid:400
  166. 1969 Buick GS 350 5.7L V8 cid:350
  167. 1969 Buick Skylark 5.7L V8 cid:350
  168. 1969 Buick Special 5.7L V8 cid:350
  169. 1969 Chevrolet Chevelle Malibu 5.0L V8 cid:307
  170. 1969 Pontiac Tempest 5.7L V8 cid:350 cc:5733
  171. 1968 Chevrolet Chevelle Malibu 5.0L V8 cid:307 cc:5031
  172. 1968 Pontiac LeMans 5.7L V8 cid:350 cc:5733
  173. 1968 Pontiac GTO 6.6L V8 cid:400
  174. 1968 Pontiac Grand Prix
  175. 1968 Oldsmobile Vista Cruiser
  176. 1968 Oldsmobile F85 5.7L V8 cid:350
  177. 1968 Oldsmobile 442 7.5L V8 cid:455 cc:7456
  178. 1968 Oldsmobile 442 7.5L V8 cid:455
  179. 1968 Oldsmobile 442 6.6L V8 cid:400 cc:6555
  180. 1968 Chevrolet Chevelle SS 6.5L V8 cid:396 cc:6489
  181. 1968 Chevrolet Chevelle SS 6.5L V8 cid:396
  182. 1968 Chevrolet Chevelle Malibu 6.5L V8 cid:396 cc:6489
  183. 1968 Chevrolet Chevelle Malibu 6.5L V8 cid:396
  184. 1968 Chevrolet Chevelle Malibu 5.4L V8 cid:327
  185. 1968 Chevrolet Chevelle Malibu 5.3L V8 cid:327 cc:5358
  186. 1968 Pontiac GTO 6.6L V8 cid:400 cc:6555
  187. 1968 Chevrolet Chevelle Malibu 5.0L V8 cid:307
  188. 1968 Pontiac LeMans 6.6L V8 cid:400
  189. 1968 Oldsmobile 442 6.6L V8 cid:400
  190. 1968 Pontiac Tempest 5.7L V8 cid:350 cc:5733
  191. 1968 Pontiac LeMans 6.6L V8 cid:400 cc:6555
  192. 1968 Chevrolet Chevelle Base 5.0L V8 cid:307
  193. 1968 Buick Special 5.7L V8 cid:350
  194. 1968 Buick GS 400 6.6L V8 cid:400
  195. 1968 Buick GS 350 5.7L V8 cid:350
  196. 1968 Buick Skylark 6.6L V8 cid:400 cc:6555
  197. 1968 Buick Skylark 6.6L V8 cid:400
  198. 1968 Buick Skylark 5.7L V8 cid:350
  199. 1968 Buick GS 400 6.6L V8 cid:400 cc:6555
  200. 1968 Pontiac LeMans 5.7L V8 cid:350
  201. show all...
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About this product

Part #: 817409

For the person who is looking for a complete Header-back dual exhaust system with an aggressive tone. With easy fit in mind, these systems are mandrel bent for maximum performance and include specially selected mufflers. American Thunder systems deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. 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

Exhaust SeriesAmerican Thunder
Exhaust TypeDual
Exit PositionDual Rear
Exit StyleStraight
Heat Shield AttachedNo
Inlet 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 LevelAggressive
System TypeHeader Back
Tail Pipe Diameter2.500 in.
Tip Quantity0
TitleFlowmaster 817409 Header-back System 409S- Dual Rear Exit - American Thunder - Aggressive Sound
Tubing Diameter2.500 in.
Additional Documents
  1. Certificate of Originpdf
  2. Installation Instructionspdf
  3. Warrantypdf

See what our community says about flowmaster products

Aaron Welliver

47

Aaron Welliver
2012 Ford Mustang
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?
The mufflers were pre-installed when I bought the car.
Is this your first time buying from this brand? Did you consider other brands?
Pre-Installed
Was it easy to install? Any installation tips that will help others?
Pre-Installed
View on Aaron'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 like the sound of Flowmaster and I like the new exhaust look
Is this your first time buying from this brand? Did you consider other brands?
no all of my other Mustangs had Flowmasters installled
View on Seth'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?
Sound of the system, quality of the flowmaster product and their name speaks for itself.
Is this your first time buying from this brand? Did you consider other brands?
No I have used flowmater before on other rides.
Was it easy to install? Any installation tips that will help others?
Relatively easy to install with the proper tool.
Once you've had a chance to use the product, did it meet your expectations?
Good purchase, very pleased
Any additional comments?
Has a bit of a drone but easy to drown out with the stereo.
View on James'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 love the way they sound and i hope the power is there i have had them for so long maybe one day ill get new stuff
Is this your first time buying from this brand? Did you consider other brands?
nope they were a find in a srap yard
Was it easy to install? Any installation tips that will help others?
nope
Once you've had a chance to use the product, did it meet your expectations?
yup
Any additional comments?
nope
View on Joseph'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
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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