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Flowmaster American Thunder Axle-Back Exhaust w/ Polished Tip (18-20 3.6L Jeep Wrangler JL)

Item J126757-JL
Market Price $138.99 You Save 12% ($16.04)
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$122.95 (kit)

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      Review & Installation Video

      Product Information

      Features, Description, Reviews, 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 2018-2020 Jeep Wrangler JL 3.6L Models


      Aggressive Exhaust Tone. Improve the ground clearance of your Jeep Wrangler’s ground clearance and 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 2018-2020 Jeep Wrangler JL 3.6L models.

      Fitment: 2018 2019 2020 Details

      MPN# 817837

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (4)

      Write a Review

      Ratings Summary

      2.2 out of 5 overall rating from 4 customers

      Installation Time: Full Day

      • August 28, 2019

        3 2018 Wrangler - AJB23 Installation Time: Less than 1 Hour

        Fit is inaccurate !!!

        Agreeing with all the other complaints on here. This exhaust does Not fit directly over your existing pipe. Flowmaster allows absolutely no give when they make this. About an 1/8 more in diameter this would be much easier. It’s a bolt on product that will need some modifications. I pretty much pried the opening of the exhaust enough to get it on with some extreme force. Then opened the clamp all the way to wrap around the bended opening and bolt tight. If your looking for something to just bolt on your gonna have an issue!

        Helpful (1)
      • August 14, 2019

        1 2018 Rubicon - HellaRubi Installation Time: Afternoon

        Not a true fit.

        The pipe does not fit. It won't go all the way on. The chrome tip taps on the frame while stopped. Very annoying.

        Helpful (2)
      • December 11, 2018

        3 2018 Wrangler - Belaire23 Installation Time: Shop Install

        American Thunder

        American thunder is what my neighbors probably called my screaming frustration as a buddy an I attempted to force on this exhaust. Finish on mine looked nice but no matter how much I attempted to force the “bolt-on” exhaust it would not fit. I called a local muffler shop to ask if they could dilate the section that was to slip over the stock exhaust pipe but I ended up having them install the axle back themselves because they said the pipe was oval at the end and had to cut off the slip over part and weld a new piece. If you have a welder and saws all then get this because if you don’t win the lottery with a piece that fits you can make it fit. Otherwise, plan on having a muffler shop install the part and save yourself the time and frustration. Gave it three stars because after it was in it clears up the rear of the Jeep well and looks good to get the stock muffler out of the space. Price is solid (not including muffler shop fee) and exhaust for a straight pipe is not as loud as you would think it would be. Gets loud around 3000-4000 RPM but at all other revs it’s very docile and a pleasure to listen to. I may weld on a MagnaFlow in the place of my resonator at a later date to even out the sound but very livable with just this. No highway drone. Also have it paired with a KandN cold air intake so idk if that changes my sound from anyone else’s. Hope this helps guys.

        Helpful (7)
      • November 30, 2018

        2 2018 Wrangler - Tim Installation Time: Shop Install

        Do not recommend.

        I ordered this part with the full intentions of slap it on quickly because it looks like a good fit. Well first thing I noticed once I got it out of the box, was a 1” split crack at the top of the pipe by the polished tip. Me being a welder I figured that’s an easy fix. So I go to install the exhaust anyway. However come to find out the stock pipe over axle is the same diameter as the fitting on the new exhaust piece.. I tried for an hour and a half to adjust the size or some how get these two pipes to fit like the intrusctions say. I wound of using my sawzaw to cut the stock pipe off and weld it on. So much for an easy install. Other then those issues it sounds good and is high clearance for sure. Goodluck!

        Helpful (10)

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      Installation & What's in the Box

      Installation Info

      What's in the Box

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

      Will It Fit My Wrangler

      • JL Rubicon 2 Door - 18, 19, 20
      • JL Rubicon 4 Door - 18, 19, 20
      • JL Wrangler 2 Door - 18, 19, 20
      • JL Wrangler 4 Door - 18, 19, 20