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Flowmaster 817494 - American Thunder Cat Back Exhaust System

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Ships by 01/31/2023
Check to see if this fits your vehicle

This part fits

  1. 2010 Ford Mustang GT 4.6L V8 cid:281
  2. 2009 Ford Mustang Bullitt 4.6L V8 cid:281
  3. 2009 Ford Mustang GT 4.6L V8 cid:281
  4. 2008 Ford Mustang Bullitt 4.6L V8 cid:281
  5. 2008 Ford Mustang GT 4.6L V8 cid:281
  6. 2008 Ford Mustang Shelby GT 4.6L V8 cid:281
  7. 2007 Ford Mustang GT 4.6L V8 cid:281
  8. 2007 Ford Mustang Shelby GT 4.6L V8 cid:281
  9. 2006 Ford Mustang GT 4.6L V8 cid:281
  10. 2005 Ford Mustang GT 4.6L V8 cid:281
Authorized Dealer

About this product

Part #: 817494

For the serious enthusiast who is looking for all the performance benefits of a complete Cat-back dual exhaust system, this is it. As an American Thunder system, it delivers an aggressive exterior sound level and a moderate interior tone that is suited to the enthusiast who wants to be heard. With maximum performance and easy fit in mind, the system is mandrel bent and includes specially engineered mufflers featuring Delta Flow technology. 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 a simple installation.

More Details

Exhaust SeriesAmerican Thunder
Exhaust TypeDual
Exit PositionDual Rear
Exit StyleStraight
Heat Shield AttachedNo
Inlet Diameter2.500 in.
Inlet Inside Diameter3.000 in.
MaterialStainless Steel
Muffler Count2
Muffler Part NumberKit Only
Muffler Series60 Series Delta Flow
Outlet Diameter3.000 in.
Outlet Outside Diameter3.000 in.
Single or DualDual
Sound LevelAggressive
System TypeCat Back
Tail Pipe Diameter3.000 in.
Tip Diameter4.000 in.
Tip Quantity2
TitleFlowmaster 817494 Cat-back System 409S - Dual Rear Exit - American Thunder - Aggressive Sound
Tubing Diameter3.000 in.
Additional Documents
  1. Certificate of Originpdf
  2. Technical Drawingpdf
  3. Installation Instructionspdf
  4. 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?
Installed b4. Simple
What were you trying to accomplish by adding this product?
Performance
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?
100%
View on David's build
Ben Couchenour

84

Ben Couchenour
1989 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?
Price and performance
What were you trying to accomplish by adding this product?
More power
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?
Yes
View on Ben'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?
Needed a muffler. Straight pipe was too raspy
What were you trying to accomplish by adding this product?
Better and quieter exhaust note
Was it easy install? Any installation tips that will help others?
Installed at local muffler shop
Once you’ve had a chance to use the product, did it meet your expectations?
Sounds good. Keeps the raspyness under control till about 4000 rpm. Can be a bit drony on the highway
View on Josh'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, axle dump so clean look, and nice aggressive sound without being obnoxiously loud
What were you trying to accomplish by adding this product?
Mostly for the truck to sound better and a little louder
Was it easy install? Any installation tips that will help others?
Very easy to install Tip: spray the hangers with some lubricant (WD-40) for ease of removing the old exhaust from the rubber and sliding the new pieces in
Once you’ve had a chance to use the product, did it meet your expectations?
Yes great sound and not annoyingly loud
View on Jacob'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?
After doing a good deal of research on different mufflers, and running into Summit Racing Equipment's video on Flowmaster exhaust series comparison video, I decided on this Super HushPower 2 muffler, which ended up being the right choice!
What were you trying to accomplish by adding this product?
My old exhaust system was rusting out (but not severely), so I thought it would be a nice project to get rid of it in favor of a lighter, better-sounding custom setup. I wanted something very sporty, but not aggressive, or too loud.
Was it easy install? Any installation tips that will help others?
Mostly yes because this part of the exhaust project was easier to put up with than the glasspack--both before and after making changes. This one was a bolt-on both times. It is secured with v-bands in case I want to swap it out, or remove it easier when I want to do something in the rear, such as dropping the rear subframe, for example.
Once you’ve had a chance to use the product, did it meet your expectations?
At first, my expectations were rather mixed. It was a bit louder than I expected before installing the glasspack, and the raspiness was more of a thing before I rearranged the exhaust to have the muffler closer to the rear. Moving it to the rear gave it the more preferred low-tone, "burbling" exhaust note I was looking for, but either way, it always sounded good--especially with a glasspack. I was even told by a few people that it sounded like a V10, noticing how similar 5-cylinder and V10 engines sound!
Any additional comments?
Definitely a nice, lightweight, and not-too-loud option for custom exhausts! It is on the quieter-end of the Flowmaster exhaust aggressiveness spectrum after all.
View on Neo'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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