Flowmaster American Thunder axle back review-UPDATE

[GI_Jo_Nathan]

Damn read this post kind of late, bought my exhaust a week ago and will be installing it Tomorrow, got it on ebay and the person dont do refunds.

If you got a good deal might be worth it. Some seem to hold up better than others.

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[OG-Surfdog]

If you got a good deal might be worth it. Some seem to hold up better than others.

Installed mine about a week ago.
I had already purchased the unit before I got to this post.
I'll be watching mine!

 

[TheGeneral]

If you got a good deal might be worth it. Some seem to hold up better than others.

Thanks

 

[SmokeStackMan]

Bumping the thread because I am considering this exhaust.

Has anyone been using the American Thunder for awhile? How do you like it?

 

[JayFromTheBay]

I called Holley today to ask about my rust issue and what I got was nothing. After getting connected to 3 different reps, the guy I last talked to said ‘it’s normal for paint to burn off after a few heat cycles and 409 stainless will start to surface rust. Best bet to sand it and spray some hi-temp on it. They won’t warranty unless it rusts thru.’
Wait, did I not buy it painted? Are you guys using regular fricken Krylon? I have painted many, many hi-temp parts and have no issue with off the shelf paint burning off. Even clear. WTF?!?. I honestly did not know 409 stainless would do this as I have had it on MX bike exhausts and never had issues. Last Flowmaster Exhaust for me. My stainless MBRP on my 2009 Ranger is fine, and it has been on the truck for 2 years, and no bed for one year or so.

I would only use 409 SS in a more temperate climate. Anywhere with snow/salt or lots of humidity you want 304 SS. 409 has higher iron content and will rust a lot faster.

 

[Stache12]

Bumping the thread because I am considering this exhaust.

Has anyone been using the American Thunder for awhile? How do you like it?

I bought the Corsa cat back duel exhaust 2 plus years ago for mine which has the 2.7. It Sounds amazing, not obnoxiously loud, and has held up great. I highly recommend it over flowmaster.

 

[SmokeStackMan]

I was looking at the Corsa as well.

I ordered the American Thunder this past Monday with the current sale, and installed it yesterday.

I am liking it so far. I haven’t done any highway driving yet, so am waiting to do that (and overall more drive time) before forming too much of an opinion on it yet.

After removing the original muffler, I started up the Bronco to see what it sounded like. I actually liked the sound with no muffler at all, which surprised me a bit.

I’m going to run the American Thunder for a bit, but can see switching to a louder option in the future.

 

[crewchief182]

Bumping the thread because I am considering this exhaust.

Has anyone been using the American Thunder for awhile? How do you like it?

2021 Black Diamond 2 door. I put the American Thunder on a few weeks back and there is honestly nothing about it that I don't like. It's not a game hanger in any way, good or bad, but I'm happy with it. The only time I even notice it is at startup when it's a tad bit throaty. Once the engine warms up, I cant tell it from stock. Even on the highway. I am showing a tiny increase in mpg, but nothing to get excited about for sure. Installed the K&N intake one week prior, so the mpg may be the combination of the two.

I had done my homework before choosing what I think is best for me. Took some advice from others before install and lightly sanded before and applied several thick coats of high heat paint, making sure to do the hangers really well. Don't need to have that investment going in the trash anytime soon due to rust. Did notice the factory paint was very thin when sanding. Had the chisel off the stock hose clamp due to it being in rough shape. Replaced a standard clamp from parts store. Putting the nuts in the frame for the one hanger took some ingenuity. Overall, happy with my choice.

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