




🔥 Elevate your Jeep’s growl and ground game with Flowmaster’s American Thunder!
The Flowmaster American Thunder Axle-Back Exhaust System is a precision-engineered upgrade for 2007-2018 Jeep Wrangler JK models with 3.6L or 3.8L engines. Featuring 2.5" mandrel bent 409 stainless steel tubing and a polished 3" 304 stainless steel tip, it delivers a moderate, deep exhaust tone while boosting performance by up to 5 HP and 7 lb/ft torque. Designed for off-road enthusiasts, it improves ground clearance and installs easily using factory mounting points, making it the perfect blend of rugged durability and refined sound.
| ASIN | B08W8W2Z5C |
| Best Sellers Rank | #100,951 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Axle-Back Exhaust Systems |
| Customer Reviews | 4.0 4.0 out of 5 stars (73) |
| Date First Available | 3 July 2022 |
| Finish type | Polished |
| Item Weight | 2.72 Kilograms |
| Manufacturer | Flowmaster |
| Manufacturer Part Number | 817942 |
| Manufacturer reference | 817942 |
| Product Dimensions | 73.66 x 26.67 x 13.97 cm; 2.72 kg |
| Tip description | single_wall |
W**Y
Mine came in good shape, welds were good. It doesn't sound like a fart can on a civic like some comments said. I had a cat back dual exhaust and it was louder than this pipe. It sounds good, deep tone at idle. Louder when you floor it but not bad at all. I recommend this pipe!
A**R
As advertised Fits like a clove.
C**Y
Installed on a 16 Jeep Jk with the 3.6 It sounds nice. Not too loud but gives it a little noise with a nice tone. The only thing I didn’t like was it has a nice chrome tip on it, but the pipe is so short, it dumps out under the Jeep where you can’t see it. Not a big deal at all and is still worth it. It fit perfectly though…down to the exhaust hangers holding it. I would recommend.
R**M
Item is as described. Good quality. Hated the sound. Drove it 100 miles and sold it. Spend a bit more and get a dual pipe with high flow muffler.
B**.
There's a lot of mixed reviews on this, but in my opinion it's great. Obviously it's going to be loud it's a muffler delete so don't be surprised. I have already took the resonator off so it would be a tad quieter if you have that still. It tucks up nice and you have way more clearance than that bulky stock muffler. I personally noticed a power increase, I have a 6 speed manual and was constantly going back and forth from 5th to 6th under 70mph ( 3" lift and 35") now I can run 55+60 in 6th no problem. 4 out of 5 stars just because I had to modify the hanger to get everything positioned to not touch frame and rattle.
Trustpilot
2 months ago
3 weeks ago