FREE 2 or 3-Day Delivery on 10,000+ Items. Details

Talk to Wrangler Enthusiasts
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Logo Image
$20K Sweeps! 10 Chances to Win! Enter Daily >
The ExtremeTerrain Show is Back! Register Now >

Flowmaster American Thunder Axle-Back Exhaust with Polished Tip (18-23 3.6L Jeep Wrangler JL)

Item J126757-JL
Call a Wrangler Enthusiast at 1-877-870-8556
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Market Price $178.99 You Save 15% ($27.04)
Our Price

$151.95 (kit)

FREE Shipping

Will this fit your Vehicle?

Select a different vehicle Help?
Update or Change Vehicle
Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    or use

      Video Review & Installation

      Ryan: This Flowmaster American Thunder Axle-Back Exhaust is for those of you that have a 2018 and up JL with the 3.6-liter V6 engine that are looking for an exhaust that's going to have a little bit better clearance off-road, but is also going to be a lot louder and have a lower exhaust note than that factory exhaust system did. This is going to be a one out of three wrench simple bolt-on install. I'm gonna show you how to do it in just a second here. This is going to essentially just delete the muffler out of your exhaust. So, you have a factory resonator, you have a factory muffler. This gets rid of the muffler, so it's going to clear up a lot of space underneath the Jeep. So, if you are off-roading, you're worried about dinging up the factory muffler, this is going to get rid of that. But because you don't have that factory muffler, it's also going to drastically change the tone and the volume of the exhaust. This is going to be one of the louder exhaust systems that you can find out there on the market that still keeps that factory resonator in place.The other nice thing about this is that it does give the Jeep a pretty nice look. It has this polished tip there, so you're going to have that added aesthetic benefit as well. Now, whenever you're looking at exhaust systems, the price is going to vary greatly depending on the material that the system is made out of. Obviously, this is just a pipe with a polished tip. There's not a lot going on here. There's no resonator, there's no catalytic converter, there's no muffler. You don't have a lot of that stuff that you would have with a full cat-back exhaust system. This is going to be pretty simple, so the material really does matter. This is going to be 409 stainless steel.Now, the three main grades you're going to find in an exhaust is aluminized steel, 409 and 304. 304 is going to be very, very resistant to corrosion. 409 is still going to be pretty resistant to any sort of corrosion, but you may get a little bit of surface rust on it, and aluminized steel, that is going to be the weakest as far as corrosion resistance goes. This is going to be a pretty high-grade stainless steel that's used here. Of course, you have that polished tip. It does come with the clamp, has the hanger weld on it, everything you need for a very, very simple one out of three wrench install, all for right around $120, which I do think is a pretty good deal, again, for quality that you're getting here of both material and the build quality as well. So, I mentioned before, nice easy install. Let's show you how to do it.Tony: Tools used for this installation are as follows. A ratchet, a 15-millimeter socket, a 13-millimeter socket, and a small pry tool.Now, let's begin the install of our new axle-back by removing our factory axle-back from our JL Jeep Wrangler. And to do that, we're gonna have to remove the two hangers that secure it to either side of the frame rail, including the clamp that connects it to our cat-back. Now, to do that, we're gonna use a 13-millimeter socket to disconnect the hangers from our frame rails. Now, they're each gonna have a bolt that goes into the frame rail, and then another one that's gonna go back towards the rear of the vehicle that goes into a small bracket just to stabilize it. Now, we're gonna use our 15-millimeter socket to disconnect the clamp here on our over-axle pipe. Once all of that is out of the way, we're actually gonna re-install our hanger here on the driver's side. We're gonna get that all buckled back into place. After that, then we'll slide our new axle-back in, and it's actually gonna go up over the sway bar, so it's gonna go in a little bit differently than our factory muffler is on here. But it's gonna look good and it's gonna sound great, so let's go ahead and get that started. And with our 15-mil, we're gonna go ahead and loosen up our clamp.Now, with our 13-mil, we're gonna go ahead and remove the bolt that goes in from the side first. Now, we're gonna get the bolt that faces towards the back right here. Now, you can just go ahead and wiggle your muffler out of the pipe. All right. Now, for our next step, we're gonna go ahead and get our muffler up in place. We're gonna go over top of the sway bar, and don't forget to put your clamp in here. We're gonna slide this on to our exhaust pipe. All right. Now, with your new exhaust pipe in place, you can go ahead and line your bracket back up that holds your hanger and bolt that down. Get your screws in and tighten them up with your 13-millimeter. And with a 15-millimeter, we can go ahead and tighten up our clamp. All right. Now, with your clamp all tightened up, our installation is complete.Now, my name is Tony and I appreciate you viewing. For more parts and videos like these, make sure you give us a visit at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Provides Moderate to Aggressive Exhaust Tone
      • Features a Free Flowing Design for Improved Horsepower and Torque
      • Single Side Exit Design
      • Built From Mandrel-Bent, 2.50-inch 409S Stainless Steel Tubing
      • Designed With a Specially Treated Polished Finish
      • Features a 3.25-inch Cut Polished Tip
      • Convenient, Bolt-On Design
      • Fits All 2018-2023 Jeep Wrangler JL 3.6L Models


      Aggressive Exhaust Tone. Improve the ground clearance of your Jeep Wrangler's performance with the Flowmaster American Thunder Axle-Back Exhaust with Polished Tip. This remarkable exhaust features a design that lets your off-roader roar as you step on the gas, so you can conquer the trail with intimidating and compelling performance.

      Superior Power and Performance. Flowmaster designed this American Thunder Axle-Back exhaust with a free-flowing feature to allow for superb, unrestricted exhaust exit. This promotes efficiency, which improves your engine’s power output. Indeed, this exhaust system will give your engine the boost it needs in high-performance driving situations.

      Heavy-Duty Design and Construction. Designed for rugged off-road applications, this 2.50-inch axle-back exhaust has been manufactured using heavy-duty, mandrel-bent 409S stainless steel to ensure maximum durability and lasting performance. It comes with a specially treated polished finish to provide lasting corrosion resistance and an impressive quality.

      Bolt-On Design for Straightforward Installation. This American Thunder Axle-Back Exhaust has been designed to directly bolt on to your Jeep’s exhaust system using its factory hangers. It includes all the needed hardware for an installation that takes only 2 hours to complete.

      Application. This Flowmaster American Thunder Axle-Back Exhaust With Polished Tip is specifically designed for 2018-2023 Jeep Wrangler JL 3.6L models.



      Flowmaster 817837

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Over-Axle Pipe Assembly
      • Installation Hardware

      Customer Reviews (16)

        Questions & Answers

        10 More Questions

        Will It Fit My Wrangler

        • JL Rubicon 2 Door - 18, 19, 20, 21, 22, 23
        • JL Rubicon 4 Door - 18, 19, 20, 21, 22, 23
        • JL Rubicon 4xe 4 Door - 21
        • JL Wrangler 2 Door - 18, 19, 20, 21, 22, 23
        • JL Wrangler 4 Door - 18, 19, 20, 21, 22, 23
        • JL Wrangler 4xe 4 Door - 21, 22