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Flowmaster 817281 - 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. 1970 Ford Mustang Mach I 7.0L V8 cid:429 cc:7030
  2. 1970 Ford Mustang Grande 5.8L V8 cid:351 cc:5753
  3. 1970 Ford Mustang Grande 5.0L V8 cid:302
  4. 1970 Ford Mustang Grande 4.1L L6 cid:250 cc:4098
  5. 1970 Ford Mustang Base 3.3L L6 cid:200 cc:3278
  6. 1970 Ford Mustang Base 3.3L L6 cid:200 cc:3277
  7. 1970 Ford Mustang Base 4.1L L6 cid:250 cc:4097
  8. 1970 Ford Mustang Base 4.1L L6 cid:250
  9. 1970 Ford Mustang Grande 3.3L L6 cid:200 cc:3277
  10. 1970 Ford Mustang Grande 3.3L L6 cid:200
  11. 1970 Ford Mustang Boss 302 5.0L V8 cid:302
  12. 1970 Ford Mustang Base 5.8L V8 cid:351 cc:5753
  13. 1970 Ford Mustang Base 5.8L V8 cid:351 cc:5753
  14. 1970 Ford Mustang Base 7.0L V8 cid:429 cc:7030
  15. 1970 Ford Mustang Base 7.0L V8 cid:429
  16. 1970 Ford Mustang Base 7.0L V8 cid:428 cc:7014
  17. 1970 Ford Mustang Base 7.0L V8 cid:428
  18. 1970 Ford Mustang Base 5.8L V8 cid:351 cc:5753
  19. 1970 Ford Mustang Base 5.0L V8 cid:302
  20. 1970 Ford Mustang Base 4.1L L6 cid:250 cc:4098
  21. 1970 Ford Mustang Grande 4.1L L6 cid:250 cc:4097
  22. 1970 Ford Mustang Grande 4.1L L6 cid:250
  23. 1970 Ford Mustang Grande 3.3L L6 cid:200 cc:3278
  24. 1970 Ford Mustang Grande 7.0L V8 cid:428
  25. 1970 Ford Mustang Grande 7.0L V8 cid:429
  26. 1970 Ford Mustang Grande 7.0L V8 cid:428 cc:7014
  27. 1970 Ford Mustang Grande 5.8L V8 cid:351 cc:5753
  28. 1970 Ford Mustang Base 3.3L L6 cid:200
  29. 1970 Ford Mustang Mach I 5.0L V8 cid:302
  30. 1970 Ford Mustang Mach I 5.8L V8 cid:351 cc:5753
  31. 1970 Ford Mustang Mach I 7.0L V8 cid:428
  32. 1970 Ford Mustang Mach I 7.0L V8 cid:429
  33. 1970 Ford Mustang Grande 5.8L V8 cid:351 cc:5753
  34. 1970 Ford Mustang Mach I 7.0L V8 cid:428 cc:7014
  35. 1970 Ford Mustang Mach I 5.8L V8 cid:351 cc:5753
  36. 1970 Ford Mustang Mach I 5.8L V8 cid:351 cc:5753
  37. 1970 Ford Mustang Grande 7.0L V8 cid:429 cc:7030
  38. 1969 Ford Mustang Boss 429 7.0L V8 cid:429 cc:7030
  39. 1969 Ford Mustang Base 5.8L V8 cid:351 cc:5753
  40. 1969 Ford Mustang Base 3.3L L6 cid:200 cc:3278
  41. 1969 Ford Mustang Base 3.3L L6 cid:200 cc:3277
  42. 1969 Ford Mustang Base 3.3L L6 cid:200
  43. 1969 Ford Mustang Base 6.4L V8 cid:390 cc:6391
  44. 1969 Ford Mustang Base 6.4L V8 cid:390
  45. 1969 Ford Mustang Base 5.8L V8 cid:351 cc:5753
  46. 1969 Ford Mustang Base 5.0L V8 cid:302
  47. 1969 Ford Mustang Base 4.1L L6 cid:250 cc:4098
  48. 1969 Ford Mustang Base 4.1L L6 cid:250 cc:4097
  49. 1969 Ford Mustang Base 4.1L L6 cid:250
  50. 1969 Ford Mustang Boss 429 7.0L V8 cid:429
  51. 1969 Ford Mustang Base 5.8L V8 cid:351 cc:5753
  52. 1969 Ford Mustang Base 7.0L V8 cid:429 cc:7030
  53. 1969 Ford Mustang Base 7.0L V8 cid:428
  54. 1969 Ford Mustang Base 7.0L V8 cid:428 cc:7014
  55. 1968 Ford Mustang Base 3.3L L6 cid:200 cc:3277
  56. 1968 Ford Mustang Base 3.3L L6 cid:200 cc:3278
  57. 1968 Ford Mustang Base 4.7L V8 cid:289 cc:4727
  58. 1968 Ford Mustang Base 7.0L V8 cid:428 cc:7014
  59. 1968 Ford Mustang Base 7.0L V8 cid:427 cc:6997
  60. 1968 Ford Mustang Base 6.4L V8 cid:390 cc:6391
  61. 1968 Ford Mustang Base 5.0L V8 cid:302
  62. 1967 Ford Mustang Base 4.7L V8 cid:289 cc:4727
  63. 1967 Ford Mustang Base 6.4L V8 cid:390 cc:6391
  64. 1967 Ford Mustang Base 3.3L L6 cid:200 cc:3277
  65. show all...
Authorized Dealer

About this product

Part #: 817281

For the person who is looking for a complete Header-back dual exhaust system with an aggressive tone. 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.
Inlet Inside Diameter2.500 in.
MaterialStainless Steel
Muffler Count2
Muffler Part NumberKit Only
Muffler SeriesSuper 44 Series
Outlet Diameter2.500 in.
Outlet Outside Diameter2.500 in.
Single or DualDual
Sound LevelAggressive
System TypeHeader Back
Tail Pipe Diameter2.500 in.
Tip Diameter3.000 in.
Tip Quantity2
TitleFlowmaster 817281 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

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?
Quality and familiarity with sound.
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?
A little cumbersome on the garage floor, but very straight forward and fairly simple (exception of left side fixed bolt bracket from existing pro chamber :o ).
Once you've had a chance to use the product, did it meet your expectations?
Yes.
Any additional comments?
I sought a sound change toward something a little less aggressive. I never knew what exactly the existing cat back brand was. They were (well, I still have them in the garage) quality built, but very aggressive,, maybe 1 chamber in each muffler albeit thin. The sound went from a rabid crackle to a now lower tone rumble. Aggressive cam sound with the stroke and metallic courtesy sound from headers are all still there. ;)
View on Adm'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?
Had em before
View on Brock'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?
This product gives you that fantastic and aggressive sound you expect out of a muscle car. Highly recommend for anyone who wants to add a bit of growl to their ride!
Is this your first time buying from this brand? Did you consider other brands?
This is my first time buying from Flowmaster and I considered corsa as an alternative before settling on the Flowmasters.
Was it easy to install? Any installation tips that will help others?
I had them professionally installed.
Once you've had a chance to use the product, did it meet your expectations?
They sounded exactly how I wanted them to sound. I was overjoyed!
Any additional comments?
They do drone a bit during MDS activation and in the 2.2k rpm range. I would recommend 12inch cherry bomb glasspack mufflers to use in place of the resonators to tone down the drone while maintaining the impressive sound. Your mileage and preferences may vary.
View on Charles'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, makes the car super loud and I love it
Is this your first time buying from this brand? Did you consider other brands?
Yes
Was it easy to install? Any installation tips that will help others?
Yes I'm a mechanic by trade so I just did it myself
Once you've had a chance to use the product, did it meet your expectations?
Yes good price for what your getting
View on Nick'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?
Other exhaust clips with this muffler on the 2.4L engine. I preffered a custom dual exhaust with two of these over pre made catbacks.
Is this your first time buying from this brand? Did you consider other brands?
First!!!
View on Paul'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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