close promo banner icon

cat-back

Flowmaster 817637 - American Thunder Cat Back Exhaust System

rating-star review rating-star review 1rating-star review 2rating-star review 3rating-star review 4(1)

$664.95

$738.95

You save: $74.00 (10%) off MSRP

stock messaging Out of StockOut of Stock
Order now to be added to the priority list
Check to see if this fits your vehicle

This part fits

  1. 2018 Ford Focus ST 2.0L L4 cid:122 cc:1999
  2. 2017 Ford Focus ST 2.0L L4 cid:122 cc:1999
  3. 2016 Ford Focus ST 2.0L L4 cid:122 cc:1999
  4. 2015 Ford Focus ST 2.0L L4 cid:122 cc:1999
  5. 2014 Ford Focus ST 2.0L L4 cid:122 cc:1999
  6. 2013 Ford Focus ST 2.0L L4 cid:122 cc:1999
Authorized Dealer

About this product

Part #: 817637

Flowmaster's American Thunder cat-back exhaust system for the 2013-2018 Ford Focus ST hatchback is perfect for the person looking for moderate to aggressive sound levels with all of the performance benefits that you would expect from Flowmaster. This bolt on DOR (Dual Out Rear) emissions legal system for the 2.0L L4 turbocharged engine features a specially tuned muffler and resonator, 2.25 inch mandrel bent stainless steel tubing, and 3.25 x 3.75 inch oval polished stainless steel tips. The exhaust system is covered by Flowmaster's Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.

More Details

Exhaust TypeSingle
Exit PositionDual Rear
Exit StyleStraight
Heat Shield AttachedNo
Inlet Diameter2.250 in.
Inlet Inside Diameter2.250 in.
MaterialStainless Steel
Muffler Count1
Muffler Part NumberKit Only
Muffler SeriesTuned Resonator
Outlet Diameter2.500 in.
Outlet Outside Diameter2.250 in.
Single or DualSingle
Sound LevelModerate/Aggressive
System TypeCat Back
Tail Pipe Diameter2.250 in.
Tip Diameter3.250 in. x 3.750 in.
Tip Length7.000 in.
Tip Quantity2
TitleFlowmaster 817637 Cat-back - Dual Rear Exit - American Thunder - Mod/Agg Sound
Tubing Diameter2.250 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?
Came with the car.
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?
Don't know.
Once you've had a chance to use the product, did it meet your expectations?
Never had any.
Any additional comments?
A little bit of highway drone.
View on Bailey'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?
Bought mandrel bends, muffler and pipe from Jegs. Can't beat their pricing. They also sell the pre-bent Flowmaster tail pipe sections, which are worth the money.
Any additional comments?
Nice quiet muffler, what I was looking for.
View on Craig'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 on the car when I got it
View on Alan'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?
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
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?
owned flowmaster products before, always happy
Is this your first time buying from this brand? Did you consider other brands?
nope
Was it easy to install? Any installation tips that will help others?
cost about $80 to install at my local Meineke
View on John'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.

shipping-worldwide from warehouse

we ship worldwide!

Based in California with 3 warehouses across the country, we’re sending out shipments everyday of the week, even Saturdays. Because your next mod shouldn’t have to wait.

+ FREE GROUND SHIPPING ON U.S. ORDERS OVER $99
Globe international shipping icon
Have a question? Ask an Expert!

Finding the best parts can be tricky

- but not to worry! Our team of experienced American Muscle, JDM, Euro, and off-road tuners are ready to answer your questions (as long as we’re not in the garage wrenching on our own builds).

chat-iconLive Chat
Ask our expert tuners anything!
call_iconCall Us
1 (800) 959-4304
Decorative testimonal quote icon

What do you get when you mix Facebook, Amazon, and your favorite online car forum? You get Wheelwell.com.

undefined supporting their testimonial

Hot Rod Magazine

Decorative testimonal quote icon

Wheelwell helps you organize all your stuff for your car, I’ve loaded all my cars on Wheelwell and you can see all the parts I’ve put in them and that may help you make a decision with your own build.

Matt Farah supporting their testimonial

Matt Farah

The Smoking Tire / The Drive

Decorative testimonal quote icon

This is an awesome new site where enthusiasts can get together and figure out what products work best on their ride.

undefined supporting their testimonial

The Truck Show Podcast