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Flowmaster Exhaust Systems - 817674

Cat Back Exhaust - American Thunder Series
  • $457.50
  • Free Shipping
  • Ships Between 12/20 - 12/24
  • What Do You Drive?


  • Style:
    Single Rear Exit (409 Stainless)
  • Material:
    With Single Exhaust Tip
  • Part #:

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Flowmaster Exhaust Systems Part #817674 Customer Reviews

Average Rating

9 Customer Reviews

Great exhaust

Reviewed by Kyle V (PORT CHARLOTTE, FL) Reviewed for a 2014 Jeep Wrangler — Jun 13, 2017 9:08 PM

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Awesome exhaust. Sounds great without the horrible drone. Extremely tight to fit under my 2014 jeep JKU.

Good Exhaust That Tucks Up Under Your Jeep

Reviewed by Josh V (Circleville, OH) Reviewed for a 2014 Jeep Wrangler — Feb 28, 2017 5:56 AM

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The exhaust system sounds good with a lower "growl" with no drone than the factory exhaust. It doesn't sound like a V8 but good for a V6. It is a very tight installation. There is barely enough clearance to route the pipe over the sway bar but it does fit. I had a button/nub on the factory y-pipe I had to cut off to get the exhaust system to shift forward enough to fit. I would recommend going to flowmasters site and downloading the installation instructions. The pictures are more clear.

Great sound and HP increase

Reviewed by CHRISTOPHER S (Delaware, OH) Reviewed for a 2013 Jeep Wrangler — Sep 29, 2016 3:12 PM

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Directions are FALSE needed two cuts not one. I would have been in trouble in my driveway. Fortunately I work at a Jeep dealership!!

Flow master cat back American Thunder series For jeep jk

Reviewed by diosdado g (Chicopee, MA) Reviewed for a 2012 Jeep Wrangler — Mar 31, 2016 8:36 AM

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Great product best sound and easy install highly recommend! Auto anything has been a great experience!

Really pleased thanks!

Reviewed by Steve V (RANCHOS DE TAOS, NM) — Jan 27, 2016 12:31 AM

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Nice rumble

GREAT Christmas Gift!!

Reviewed by Denise S (AURORA, CO) Reviewed for a 2015 Jeep Wrangler — Dec 28, 2015 4:06 PM

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My husband purchased the new exhaust and muffler system for me for Christmas and I absolutely LOVE, LOVE, LOVE IT!! It has JUST the sound I was looking for, and although he had a bit of a time getting the old system off, the new system installed perfectly!

Flowmaster on 2009 JKU

Reviewed by William K (LAUREL, MD) Reviewed for a 2009 Jeep Wrangler — Aug 07, 2015 8:32 PM

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Awesome exhaust. Small but rumbly! Not obnoxious, but not quiet. Somewhere inbetween.

American Thunder Series / Jeep Wrangler 2dr

Reviewed by Mark S (Temecula, CA) Reviewed for a 2012 Jeep Wrangler — Mar 17, 2015 8:02 PM

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I installed this myself in about 2hrs.This system has great ground clearance, but the muffler sits too close to the floor and rattles against the floor. I will have to put a dip in the inlet & exit pipes at both muffler joints to fix this clearance to floor issue. I love the sound shifting through the gears at lower speeds. 75mph on the highway is a little loud inside the cab.I can't wait to take the top off cause then it doesn't matter ! Great power, and I think I picked up a little MPG too !

Flowmaster rock crawler system

Reviewed by Thomas W (east hampton, CT) — May 22, 2014 7:19 PM

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2012 JK system looks good provides lots of clearance. Sound is not the best but at less than WOT it is OK. Jeep seems to be more responsive with less resrictive exhaust.