Flowmaster Cat-Back Exhaust System American Thunder 2-1/4" with Polished Oval Tips Stainless Steel Focus ST 2013-2016

Flowmaster: 817637
MSRP: $819.33
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Flowmaster Cat-Back Exhaust System American Thunder 2-1/4" with Polished Oval Tips Stainless Steel Focus ST 2013-2016
Flowmaster Cat-Back Exhaust System American Thunder 2-1/4" with Polished Oval Tips Stainless Steel Focus ST 2013-2016 Flowmaster Cat-Back Exhaust System American Thunder 2-1/4" with Polished Oval Tips Stainless Steel Focus ST 2013-2016 Flowmaster Cat-Back Exhaust System American Thunder 2-1/4" with Polished Oval Tips Stainless Steel Focus ST 2013-2016 Play Flowmaster Cat-Back Exhaust System American Thunder 2-1/4" with Polished Oval Tips Stainless Steel Focus ST 2013-2016 Video 1 Play Flowmaster Cat-Back Exhaust System American Thunder 2-1/4" with Polished Oval Tips Stainless Steel Focus ST 2013-2016 Video 2 Play Flowmaster Cat-Back Exhaust System American Thunder 2-1/4" with Polished Oval Tips Stainless Steel Focus ST 2013-2016 Video 3

Product Description

Flowmaster American Thunder 2-1/4" Stainless Steel Cat-Back Exhaust System with Polished Oval Tips for 2013, 2014, 2015 and 2016 Focus ST.

The Flowmaster American Thunder cat-back exhaust system is designed to deliver extra horsepower and volume to the roar of your 2013-2016 Ford Focus ST. This sleek, modern, and high-quality system is perfect for anyone who wants to show that their Ford Focus ST is no joke it’s a high-performance, smooth, and powerful driving machine.

As the name implies, a cat-back exhaust system is back from the catalytic converter, and using different cat-back systems can give you different results for your Focus ST. Specifically, Flowmaster developed this cat-back exhaust to maximize the performance of the Focus’s 2.0-liter turbocharged engine, even if you haven’t modified the engine itself yet. That makes it a great way to start working on the overall performance of your favorite ride.

This Flowmaster American Thunder cat-back system includes everything you need to install a brand-new exhaust. It even comes with durable and attractive metal tips that have been polished to a mirror sheen, making the whole system look great. Plus, its durable interior and exterior are sure to stand up to regular, everyday use, even if you drive your Focus ST all over the place.

You can install this Flowmaster cat-back exhaust system using basic tools and a garage lift. Conveniently, Flowmaster built this exhaust system to fit OEM parts so you don’t have to worry about buying new brackets or hangers. It also comes with additional brackets so you can be sure your new system is securely in place after it’s installed.

Flowmaster's cat-back system features 2-1/4" mandrel bent stainless steel tubing. A tuned resonator style muffler delivers a moderate to aggressive exhaust sound. All parts are welded together and built to last. Dual polished oval 3-1/4"x3-3/4" tips exit the center of the rear bumper. Flowmaster's cat-back is dyno tuned for maximum performance. Get the most power out of your 2.0L turbocharged engine with Flowmaster's exhaust system. When you get a Flowmaster system, you’ll notice a couple qualities and benefits to your Focus ST right off the bat.

Features and Benefits:
- High-quality, stainless steel, corrosion-resistant tubing.
- Tuned, resonator-style muffler for a better sound.
- Sleek, strong, and rolled tips.
- General performance improvement.

The American Thunder cat-back is perfect for the person looking for moderate to aggressive sound levels with all of the performance benefits that you would expect from Flowmaster. Flowmaster's cat-back bolts in place of your original exhaust. Just like all Flowmaster products, this exhaust system features high quality components and construction for long lasting life. Made in the USA!

Please Note: Ford designed the 2015 Focus ST with four exhaust hangers but only added three on the factory exhaust system. All aftermarket exhaust systems are built to use that fourth exhaust hanger. CJ Pony Parts recommends the purchase of COBB’s Polyurethane Exhaust Hanger Kit (591001).

This Flowmaster cat-back exhaust system is the durable, powerful, and long-lasting upgrade you need to get superior performance out of your Focus ST. While the Focus may not be the first car people think of when they think of “power,” that doesn’t mean you can’t turn yours into a high-powered driving machine that can keep up with the best! Whether you want a smooth ride down the highway or break-neck speeds on the racetrack, this exhaust system is a critical part to take your Focus ST to the next level of performance.

So what are you waiting for? Upgrade the look, feel and overall performance of your 2013, 2014, 2015 or 2016 Focus ST with Flowmaster's American Thunder 2-1/4" Stainless Steel Cat-Back Exhaust System with Polished Oval Tips from CJ Pony Parts today! And check out our installation video for free instructions on how to rig up your new exhaust!

Similar Focus Parts

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Installation Instructions

Mustang Installation

Focus Applications

This product will fit the following Ford Focus years:

Product Reviews

Write a review
Flowmaster Cat-Back Exhaust System American Thunder 2-1/4" with Polished Oval Tips Stainless Steel Focus ST 2013-2016 is rated 4.571428571428571 out of 5 by 7.
Rated 5 out of 5 by from FlowMaster Cat-Back Exhaust- 2015 Focus ST I installed the FlowMaster about 6 weeks ago and all I can say is wow! The sound is awesome and the price was very competitive. The pops and crackles sound super good. I've gotten so many compliments on how good the FlowMaster sounds on my ST. You will not be disappointed with this Cat-Back exhaust.
Date published: 2016-03-13
Rated 5 out of 5 by from Love it I'm very happy with this exhaust,sounds amazing. There's some drone what is fine by me,the drone is not to bad,it's nothing like you cant hear the person beside you. I took my wife for a drive after installation was done and we were talking and I even ask her if the drone was to much and she even said no not at all so it passes the test.lol Sounds amazing inside and outside the car so I'm a very happy customer.
Date published: 2016-02-05
Rated 5 out of 5 by from Sounds amazing!!! Easy installation looks great sounds amazing very impressed.
Date published: 2015-01-09
Rated 4 out of 5 by from Exhaust I like the tone and sound just wish it was a little louder
Date published: 2015-07-14
Rated 5 out of 5 by from Sound is perfect for me Great sound. Especially with the cpe cold air intake. Nice gurgle when downshifting and not obnoxious at all in the cab. Love it.
Date published: 2016-10-19
Rated 5 out of 5 by from Sound of perfection Great sound, not too loud and obnoxious. Has a deep throaty sound at lower rpms.
Date published: 2016-07-02
Rated 3 out of 5 by from Clamps and tip hardware are junk This was the worst experience I've ever had installing an exhaust system. I have installed more than a few systems on my old GMC truck and 1990 Civic, two of them from Flowmaster. Fitment of pipes and joints were spot on. Quality of pipes and muffler are also very good. However the strap clamps for the pipe joints and the clamp bolts provided for the tips, NOT GOOD. 1. Two of the clamps, one off the first to second transition and the one from the second to third transition would not tighten enough to prevent the pipes from twisting at the joints. This is critical to leveling the system and preventing it from sagging into the cross brace under it's own weight. Broke the bolt studs on both of them trying to get them to stop twisting. Yes, the rest of the system was loose. Ended up with standard clamps to do the job, I just plan on replacing them if they rust out before I get rid of the car. Just hit me, maybe if you remove the stops in between the clamp you can get the tension you need to null the slippage? 2. The 6mm bolts provided for clamping the tips stripped the threads before they were even snug on the pipe. One trip to hardware store. Thought 1/4"-20 stainless would do the trick, nope snapped both of those, again before the tips were even snug. Second trip, this time went all in and got grade 8 1/4"-20 and finally was able to get them snugged down to where they weren't flopping all over the place. On the plus side, the sound is superb! Full throttle gets you the grins and minimal drone at highway cruising speed, you forget you even have it.
Date published: 2016-05-13
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Product Questions

Hello, I'm interested in this exhaust but would need it sent to the uk. Could you sent me information regarding cost of shipping. thanks

Asked by: Alan Mather
To get a shipping quote and total price, add the item(s) to your shopping cart and then proceed to checkout. In checkout, fill out your address info and scroll down to see shipping options and costs to your area including any import taxes and duties.
Answered by: CJPP Dave
Date published: 2016-10-07

Does this kit come with new exhaust hangars or do we need to order them separately? 

Asked by: Kgoodson
This kit includes everything necessary for installation. We do usually recommend adding P/N: 591001 because it is a better material then factory, but it is not necessary.
Answered by: CJPP Dave
Date published: 2016-10-03

Under what conditions will this void my warranty, if any? I drive a Tuxedo Black 2016 Focus ST.

Asked by: cosgrove
Unless the product in question is directly responsible for an issue, your warranty should remain intact. Read up on the Magnuson-Moss Warranty Act for more details.
Answered by: rk cjpp
Date published: 2016-08-17

I want be sure this fits a 2016 focus st, but when you look on flowmasters website it wont let you select it for the 2016. So does it for sure fit the 2016?

Asked by: Nbain17
Yes, it fits a 2016
Answered by: CJPP Dave
Date published: 2016-08-04

Would this exhaust fall under the sound level of 95 dbA or less category? Or do you know where I can find this information?

Asked by: jacobst4
We do not keep track of that information. I recommend contacting the manufacturer directly to see if the decibel level of this exhaust kit has been recorded.
Answered by: CJPP Dave
Date published: 2016-06-30

Would you need a access port for this product?

Asked by: leo_st
Answered by: CJPP Dave
Date published: 2016-05-31

hi will this system fit late 2012 focus st please.

Asked by: telboy70
Yes it should fit.
Answered by: rk cjpp
Date published: 2016-04-20

I saw it was confirmed to fit on 2015, how about 2016 any complications there?

Asked by: zpst93
It ill also fit a 2016 ST.
Answered by: CJPP Dave
Date published: 2016-03-23
  • 2016-10-22T08:17CST
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Product Video

Flowmaster Cat-Back Exhaust System American Thunder 2-1/4" with Polished Oval Tips Stainless Steel Focus ST 2013-2016 Video Transcript
By Bill Tumas: Obviously, we're Mustang enthusiasts here at CJ's, but we're actually fans of all Ford's high-performance vehicles, including the SVT Raptor, Taurus SHO, and the latest creation, the Focus ST. With its 252 horsepower turbocharged 2 liter, Recaro seats, and high-performance breaks and suspension, this is one hot hatchback. Today, we're going to add some performance and sound to our Focus by installing this Flowmaster exhaust system.

The system is designed by Flowmaster specifically for the Focus ST and as part of their American Thunder series. It's fully stainless steel with all mandrel pipes leading through a high flow muffler, and finishing off with a pair of double walled rolled stainless steel tips. The center exit exhaust is one of the unique features found on the Focus ST. It doesn't sound bad for a stock system. We're sure the Flowmaster's going to give us improvement in sound as well as performance, so let's get started.

For this installation, you'll need a jack and jack stands or a lift and pole jack, Sawzall, 1/4 inch ratchet, 3/8 deep socket, 3/8 ratchet, we suggest a 3/8 impact gun, 5/8 shallow socket, 10 mm socket, 15 mm socket, 11/16 wrench, 15 mm wrench, exhaust gasket tool, and safety glasses.

Once you have the car off the ground, we're going to remove the stock system. In this case, the stock system is welded front to back. The only way to remove it is going to be to cut it right here in the middle so you can separate the front and the back. Now we're going to spray some penetrating lubricant on the bolts in the front, as well as all the hangers to make them easier to take off. We'll start removing the front of the exhaust system by first removing this brace from the floor.

There are studs going from this side through and there's retaining nuts on the other side. Either come in with a socket over the top, in our case, we need a ratchet and wrench, just get them right here from the front. Now we'll separate the factory muffler from the flex pipe. You'll want to remove the gasket here as it is reused with the new system. Now remove the pipe from the hanger. Then, remove the stock muffler. Here you can see the stock muffler verses the Flowmaster muffler we're installing. Obviously there's a fairly large restriction there we're going to be taking out with the Flowmaster system.

Before we move on to the muffler and the tip, and we didn't get the hanger for the tailpipe. It's located right on top here. Now, we're going to remove the muffler and the tip assembly. Start by taking off the hanger on the driver's side. Next we'll take the passenger side one off. Now, lower this down. Push the pipe through the opening. Now, we'll install the new bolts that came with the kit. Install the gasket. Put it up into place. We have our jack to hold it for us. Now, we'll install the washers and the nuts on the other side. At this point, hand tight is fine and move on to the rest of the system.

Next, we'll grab the S-shaped pipe and one of our supplied clamps. Install that in the factory hanger. Now we'll tighten up the clamp, push to the edge where the pipes connect. Just get it snug. We still want to be able to adjust it. Grab the tailpipe. Just want to feed it up over. Fit it to the front and then slide it over so you can get the original hanger hooked up to it. Once again, we're going to tighten the clamp. Just get it snug, not all the way tight. Going to put a clamp on the tailpipe section here. Start by hanging the passenger side first. You're going to connect it to the rest of the tailpipe. Slide it on the driver's side. Get it centered as best you can.

Now, we start tightening to the rest of the system. I'll start by tightening the bolts at the front here. You want to hold it up while you tighten it. You can do this with a ratchet, but an impact makes it a lot easier. You want to check the clearances make sure nothing's touching. Then we can move onto the exhaust tips. Slide them over the edge. Want to get them centered and equal distant in the opening. Then we can tighten them down.

Now, we have everything fitted and tightened down, we can reinstall the front brace. Installation's finished. Now, that we're done the installation, let's fire it up and see how it sounds. Just like we expected, a much more aggressive sound. You can even hear the turbo through the exhaust now. Thanks to Flowmaster our Focus ST now sounds as aggressive as it looks. Removing those two large factory mufflers freed up some horsepower and also shaved some weight at the same time. Installation should take you around two hours. You'll be back on the road in no time.

For more Focus ST installation videos, make sure you subscribe to our YouTube channel.