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Flowmaster American Thunder Stainless Steel Single Exhaust System - Side Exit (09-10 5.4L F-150, Excluding Raptor)

Market Price $759.99 You Save 12% ($89.04)
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  • Item T527176-AC

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    Features, Video & Details

    • Aggressive Flowmaster 50 Series HD Sound
    • Durable 409 Stainless Steel Construction
    • 3.5 in. Mandrel-Bent Tubing
    • 4 in. Polished Stainless Steel Tip
    • Exits Behind Rear Passenger Tire
    • Easy Installation; Some Trimming May Be Required
    • Fits All 2009-2010 5.4L F-150s, Excluding Raptors

    Review & Installation Video

    Review & Install Video

    The Flowmaster American Thunder Stainless Steel Cat-Back Exhaust is available for any '09 to '10 to 5.4 liter F-150 owner who's looking to pick up the good old classic American muscle sound for their truck. This system is the single side exit system which will definitely put some aggression back into your motor and turn up the volume, giving it a deeper growl. The installation for this is pretty straightforward, however it might require you to make one single cut to the included extension pipe here, depending on your capsize and bed length. Either way, still giving this one one outta three wrenches on our difficulty meter which I'll definitely talk more about later on. First things first, let's tackle what's going on on everybody's mind, and that's of course the sound. The American Thunder system is one of the most classic sounds you can get for your V8 engine. It's been around for so long and creates such an American muscle growl at idle, and they can really scream at wide open throttle. With that said, I wouldn't call this the loudness system, I'd probably rank it at about four outta five on our loudness meter. You won't have too much drone inside the cab, if any, which is great for the guys looking to keep things mellow inside the truck in order to easily listen to music or have a conversation. You'll notice when shopping around that Flowmaster offers essentially two different versions of the American Thunder as far as construction goes. There's the stainless steel we have here and the aluminized option on the site as well. Both of them will produce essentially the same sound, the durability, and longevity of them will differ, as well as the price. This one is 409 stainless steel, meaning it is better suited for the wintery weather areas out there, seeing a lotta road salt, and it holds up better off-road. The aluminized option is best for truck owners looking to stay on a tighter budget, but who still want the American Thunder sound. Won't hold up as long as the 409 here, but obviously it's more affordable. This one all around will be more durable and will last you a few more years. This one's made right here in the U.S. from a tough 3.5 inch mandrel-bent 16 gauge 409 stainless steel as I just mentioned, which is known for its corrosion resistance. The muffler system is really the star since it is the 50 series HD Flowmaster muffler, which is built to be specifically for guys who do a lot more heavy-duty truck things, like hauling, towing, or worksite related tasks. It's got four-inch internal components, and a large case size, and the three chamber design. They'll ultimately help with mileage, small horsepower and torque gains, as well as throttle response because of the better airflow. The mufflers are also 16 gauge steel, fully MIG-welded for stronger finishes, and the exhaust was topped off with four-inch polished stainless steel tips that'll dump behind the rear passenger side tire, thanks to the single side exit design. And the tip will also have of course the Flowmaster name embedded right into the materials, as you can see here. This one falls right in the middle of the pack as far as pricing for a full cat-back, coming in right around the $650 mark. My opinion, not too bad of a price tag. Pretty average for a durable stainless steel. If you're looking to cut down cost a bit, maybe check out the aluminized option I mentioned earlier or some of the more entry-level MBRP options for an even better price. Flowmaster also offers the same two American Thunder systems with a split rear and split side exit design. You can even pick up the system that includes both exits styles for a bit more customization on the fly. The installation, as I mentioned earlier, might require you to cut once into the extension pipe provided in the kit as you can see here, depending on your cab size and bed length. That's all laid out for you in the instruction manual, and some of you guys might not even have to cut anything. Some of you might not have to use this at all. It's all detailed for you from Flowmaster. Aside from that, you wanna have a cutting tool of your choice on deck, like a Sawzall or something similar, ratchet and socket set will do the trick as well, and a jack and jack stands, or a lift if you have access to one. Still given this one one outta three wrenches on our difficulty meter. You should be able to tackle this one in about an hour or two in the driveway or shop. You'll first need to get the truck in the air and support it on jack stands or a lift if you have access to one like I just mentioned. Remove the two bolts holding the front flange and loosen the band clamp to pull the muffler assembly back and remove it from the hanger isolator. Slide the assembly over and out of the rear axle. Next, you'll need to mount the left hanger bracket in the Flowmaster kit using the hardware provided. You'll need to, at this point, make the cut, if required, to the extension pipe provided in the kit depending on your cab size and bed length combo. Some size combos won't need to cut at all, others might not even need to use it at all. All of that is detailed in the instructions. And if you do need to cut, they'll let you know just how much. Remember to measure twice and cut once. From here you can put the inlet pipe through the OEM mid-pipe and bolt the flanges down, then insert the inlet hanger into the factory isolator location. Install the muffler inlet to the back of the inlet pipe you just installed and mount the hanger. Put the clamp onto the muffler outlet and then slide the tail pipe with the exhaust tip already welded to it to the end of that muffler and tighten it down. At this point I'd probably recommend going back throughout each of the clamps in the kit, tightening everything down, making sure it's torqued to spec. And then from there you're good to go. Well that just about wraps this one up. So if you're the owner of a 2009 to 2010 5.4 liter F-150, you might wanna check out the Flowmaster American Thunder Stainless Steel CatBack single side exit exhaust, which you can find right here at

    Distinctively Flowmaster. The signature sound of Flowmaster is powerful and unmistakable. It’s a growl that exudes high-quality and peak performance. If you want it for your 5.4L F-150, use AmericanMuscle’s American Thunder Cat-Back Exhaust system to elevate your V8 truck exhaust flow with an unrivaled surge in power that you can feel and hear. The 50 Series HD muffler is included and can deliver that bursting, dynamic sound that says Flowmaster.

    Top Performance Engineering. The Flowmaster American Thunder Stainless Steel Cat-Back Exhaust - Single Side Exit evolves the F-150 from basic to advance with superior engineering and construction. You’ll experience limitless power in this upgrade all F-150 owners must consider to maximize their investment. It isn’t just about the oohs and aahs of colleagues, it’s about reaching the true potential of the F-150.

    Proudly American Made. Designed and manufactured in the USA, the Thunder Cat-Back Exhaust system features hard-wearing 409 Stainless Steel Construction, 3.5-inch Mandrel-Bent Tubing, and 4-inch Polished Stainless-Steel Tip. Its construction guarantees lifetime performance.

    No Worry Installation.The Thunder Cat-Back Exhaust replaces the F-150’s stock exhaust. Everything is in this kit to make installation simple and problem-free. Just use standard hand tools. No modifications are needed to your F-10. Minor trimming required on some cab sizes and beds.

    Application.This Flowmaster American Thunder Stainless Steel Single Side Exit Cat-Back Exhaust is designed to fit on all 2009 to 2010 F-150s powered by the 5.4L engine. It is not compatible with the 5.4L SVT Raptor.

    Fitment: 2009 2010 Details

    MPN# 817567

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Inlet Pipe
    • (1) Extension Pipe
    • (1) Muffler
    • (1) Tailpipe
    • Hardware Kit
    Installation Info
    Tech Specs
    Will it fit my F-150?

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