The classic sound of a Flowmaster chambered exhaust, our American Thunder Series features mufflers tuned to deliver more power, torque, throttle response and mileage. Best of all, these exhaust systems take sedate vehicles and delivers a deep aggressive tone.
4 Wheel Parts offered competitive pricing and fairly quick delivery. The Flowmaster American Thunder Exhaust System was installed on my 2009 Jeep Wrangler Rubicon to replace a now worn out AFE exhaust. Important to note that this is not a bolt on system and some modifications had to be made. Funny how Flowmaster said this would fit both a 2 door and a 4 door Jeep, system was not exactly long enough for the 4 door. After everything was properly configured, this new exhaust sounds great and the Jeep is performing well!
Installed at the 4WP Houston Westheimer location. Did a great job. Has a nice gurgle from 0-3000 rpm, with it mellowing out in the higher rev range. So around town, it sounds like I'm riding an old school mustang. Straight out the back. 2017 F150, XLT, RWD.
My review is not in regards to the product but for the website and company 4wheelparts who let me order online gave a ship and delivery date but weeks later sent me an email stating this items is not in stock. Really? Bad customer service and online system.
Q: Can you get this with black tips? Answer this question
A: # FLW15398B (Black Tip)
Answered by Dave from 4WP HQ on 02/18/2022
A: Thank you Fred31, Flowmaster is only making this - Flowmaster American Thunder Cat Back Exhaust System - 817933 with Polished Tips at this time.
Answered by Dave from 4WP HQ on 08/02/2021
Q: 2022- 2500 hd gas 6.6 L8T. Will you offer black tips .? If so when.? Answer this question
A: You can order the Exhaust Tip - 4.00 in. Black Angle Cut Fits 3 in. Tubing - Clamp On Part # FLW15398B
Answered by Dave from 4WP HQ on 02/18/2022
Q: Is this bolt on or is cutting required? Answer this question
A: According to the instructions it does look like you need to make a cut. Step 3 says: Support then cut tailpipe at muffler exit: https://documents.holley.com/817913_instructions.pdf
Answered by Kelly from 4WP Corporate Headquarters on 06/21/2021
Q: Is there a black tip version? Answer this question
A:
Hello Greg,
Not sure if you have the 5.0L. This Part FLW817725 has an awesome sound profile (the best in my opinion with the 5.0L). We do offer the tips (sold as single tip) FLW15397B. We also offer different Flowmaster Cat-Backs with black tips, but they do not sound the same. Below I will link the American Thunder series and I will put 2 other options and a YouTube link so you can hear how it may sound.
This is the "American Thunder" series FLW817725
https://www.youtube.com/watch?v=nxCSQxPg5Ec&t=14s
We have the "Outlaw Series" part number FLW817726.
https://www.youtube.com/watch?v=-Hlc8rFgIXI&t=14s
We also have the "FlowFX" Series FLW717871 (in the video its not the 5.0L engine but the 3.5L)
https://www.youtube.com/watch?v=PmiUDSfjZfU&t=23s
Thanks for checking us out.
Answered by Ralph from 4WP HQ on 04/09/2021
Q: It says not vehicle specific- but only talks about being for Dodge Ram in the description, will it work on a 13 f-150? Answer this question
A: No, this exhaust system is for the Dodge Ram 1500 only.
Answered by Christian from 4WP HQ on 12/24/2020
For over 30 years, Flowmaster has been producing exhaust products to combat noise issues that first cropped up on race tracks in California. The question was how to reduce sound without compromising performance? Advanced engineering and ample testing set Flowmaster's product line apart from competitors and a few of their more noteworthy parts include chambered mufflers, laminar flow designs and high flow catalytic converters. We carry Jeep exhaust pipes, exhaust flanges and complete exhaust systems among other Flowmaster products. The company's patented technologies, innovative designs and focus on performance keep Flowmaster at the forefront of aftermarket exhaust manufacturers. Shop Flowmaster Exhaust Now
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