Flowmaster Cat-Back Exhaust System American Thunder 2-1/4" with Polished Oval Tips Stainless Steel Focus ST 2013-2018

92% of 100


  • Tuned, Resonator-Style Muffler
  • 409 Ss Construction
  • 2-1/4" Mandrel-Bent Tubing
  • 3-1/4" Polished Exhaust Tips
MSRP $920.00
You save 10%

Flowmaster American Thunder 2-1/4" Stainless Steel Cat-Back Exhaust System with Polished Oval Tips for 2013, 2014, 2015, 2016, 2017 and 2018 Focus ST.

The Flowmaster American Thunder cat-back exhaust system is designed to deliver extra horsepower and volume to the roar of your 2013-2018 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, 2016, 2017 or 2018 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!

California Residents: Proposition 65 Warning

Installation Videos

Video Transcript

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.

Vehicle Fitment

This product will fit the following Focus years:

Only registered users can ask/answer questions. Please sign in or create an account.
Write Your Own Review
Only registered users can write reviews. Please Sign in or create an account