axle-back

Flowmaster 17421 - American Thunder Axle Back Exhaust System

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This part fits

  1. 2009 Ford Mustang Base 4.0L V6 cid:245
  2. 2008 Ford Mustang Base 4.0L V6 cid:245
  3. 2007 Ford Mustang Base 4.0L V6 cid:245
  4. 2006 Ford Mustang Base 4.0L V6 cid:245
  5. 2005 Ford Mustang Base 4.0L V6 cid:245
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About this product

Part #: 17421

This aggressive sounding system is designed to replace the original rear mounted mufflers located behind the rear axle. With easy fit in mind, the system is mandrel bent for maximum performance and includes specially selected mufflers to support the performance image of the car. As an America Thunder system, it delivers an aggressive exterior tone with moderate interior sound level that is 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, the system includes all necessary parts and hardware for easy installation.

More Details

ColorBlack
Exhaust SeriesAmerican Thunder
Exhaust TypeSingle
Exit PositionSingle Rear
Exit StyleStraight
Heat Shield AttachedNo
Inlet Diameter2.500 in.
MaterialAluminized Steel
Muffler Count1
Muffler Part NumberKit Only
Muffler Series60 Series Delta Flow
Outlet Diameter2.500 in.
Outlet Outside Diameter3.500 in.
Single or DualSingle
Sound LevelModerate
System TypeAxle Back
Tail Pipe Diameter2.500 in.
Tip Diameter3.500 in.
Tip Quantity1
TitleFlowmaster 17421 Axle-back System 409S - Single Rear Exit - American Thunder - Moderate 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?
Deep quality sound.
Is this your first time buying from this brand? Did you consider other brands?
No. And yes I considered a few different brands.
Was it easy to install? Any installation tips that will help others?
Yes.
Once you've had a chance to use the product, did it meet your expectations?
A little on the quiet sid but good sound
View on Josh's build
Michael Curbelo

290

Michael Curbelo
1988 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 way it sounds on the car and the reviews that it got is what sold me on buying it
Is this your first time buying from this brand? Did you consider other brands?
I’ve had this brand before but of different mufflers and I was considering getting SLP loudmouth bullet style mufflers
Was it easy to install? Any installation tips that will help others?
Was easy to install everything bolted right up
Once you've had a chance to use the product, did it meet your expectations?
It exceeded my expectations
View on Michael'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 came installed on the car when I purchased it.
Is this your first time buying from this brand? Did you consider other brands?
First time with this brand. I would consider going to Magnaflow or Borla again, although the Flowmasters do sound amazing, they are a bit loud for normal use.
Was it easy to install? Any installation tips that will help others?
Came installed on the car, but the fit is good.
Once you've had a chance to use the product, did it meet your expectations?
These make the car sound very aggressive, you can hear the car coming from the other side of my small town. So they sound bad ass...but can be annoying for your neighbours and police.
View on Brett'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?
Previous owner installed it.
Is this your first time buying from this brand? Did you consider other brands?
Yes but it looks and sounds awesome!
Once you've had a chance to use the product, did it meet your expectations?
Sounds amazing for a v6
View on Nate'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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