Flowmaster American Thunder 2-1/4" Stainless Steel Cat-Back Exhaust System with Polished Oval Tips for 2013, 2014 and 2015 Focus ST.
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.
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).
So what are you waiting for? Upgrade the look, feel and overall performance of your 2013, 2014 or 2015 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!
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Product ReviewsWrite a review
Does this kit flomaster 817637 come with the lower facia for the SE and will it fit the 2014 focus se
I just recently installed this exhaust and after running a few times I got a check engine light and checked the fault it was for turbo pressure. Have you heard of this exhaust causing any problems with that?
Will this exhaust pass California emission laws?
Will this system fit on a 2015 Focus ST?
Hey I just have a quick question. Is it possible to swap the tips to the stock one?
Is this american Thunder catback made out of 304 stainless or 409?
I am looking for an exhaust kit that is louder than stock but not so much to get me into trouble with the law (or my dad). I love the sound of this cat-back kit, is it too loud?
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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.
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