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Flowmaster Exhaust Systems Cat Back Exhaust - American Thunder Series - 817423

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  • $136.95 - $2,266.95  List Price
  • $719.95
  • What Do You Drive?

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  • Style:
    Dual Rear or Side Exit (409 Stainless)
  • Material:
    With Dual Exhaust Tips
  • Part #:
    817423
  • Main piping diameter: 2.5"
  • 50 Series HD Muffler
  • Includes dual 3" exhaust tips
  • Includes exit pipes for dual rear or dual side exit
  • Download installation instructions (PDF)

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Flowmaster Exhaust Systems Part #817423 Customer Reviews

Average Rating

12 Customer Reviews

Dollar for Dollar, You can't Beat the Performance

Reviewed by John M H (SUFFOLK, VA) Reviewed for a 2008 Dodge Ram — Jan 10, 2018 7:29 AM

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I had a shop install the Cat Back American Thunder system on my RAM, 5.7 Hemi. This was a "replacement" for a system that came with the truck when purchased used. My son and I can not get over the marked difference in sound and performance with this new system. It is like driving a new truck. The engine runs smoother and operates like it has another 40 horses under the hood! At idle, the sound is barely noticeable in the cabin. Acceleration is the sound of new power. Great purchase!!!

Nice system overall

Reviewed by Kris N (Snohomish, WA) Reviewed for a 2008 Dodge Ram — Dec 08, 2017 8:18 PM

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Always love Flowmasters and have had them on our family's trucks for years. Flowmaster sales and customer support folks are absolutely the best! Really nice system and pretty dang easy to install with simple tools. Make sure you have a breaker back and a deep 15mm socket for the install. Feedback: The exhaust tips wouldn't tighten enough, so have to tack them probably. Clamps have to be adjusted to the right position or you have small exhaust leaks which is slightly tedious.

Konrad

Reviewed by Konrad S (Kewaunee, WI) Reviewed for a 2008 Dodge Ram — Mar 07, 2017 7:10 AM

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Had to get rid of the stock exhaust. Always was a fan of Flowmaster. Installed it and noticed a 1+ mpg increase as long as I keep my foot out of it. Nice sound, not too loud that every cop will hear me but loud enough to be noticed.

2008 Ram 1500 Big Horn w/ American Thunder Cat Back

Reviewed by David M (Nashua, NH) Reviewed for a 2008 Dodge Ram — Jan 03, 2017 6:06 AM

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The system looks and sounds very good. Two changes I would like to see is that the: Muffler in the Stainless Kit should be made of Stainless also, And the 3" tube should go all the way up to the Cat/Headers. I purchased a 5 ft length of 3" SS tubing for $45 on ebay to do this. This only needed to be swagged to 3" ID by a local Muffler Shop.

Mopar sound!

Reviewed by Steven Y (Tully, NY) — Apr 25, 2015 10:12 PM

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This is a real nice kit! Well thought out and constructed! Everything sounds awesome, a little louder than stock.I put it on my Hemi QuadCab. Nothing sounds nicer than that Mopar sound!

Flowmaster American Thunder Stainless Steel exhaust system.

Reviewed by Thomas B (Oak Lawn, IL) — Apr 04, 2013 9:13 PM

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1 of 1 people found the following review helpful.

I looks as good as it sounds, and was very easy to install. The other thing is that I am still able to use my existing spare tire.

2007 dodge ram 1500 crew cab, not loud in cab

Reviewed by Brendan S (Rocky Point, NY) Reviewed for a 2007 Dodge Ram — Dec 13, 2012 7:02 AM

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2 of 2 people found the following review helpful.

Nice exhaust, took about 2.5 hours to slap up with hand tools. Nice clean install not to fond of the clamps, i like the other u clamp style that really crimps on the pipe but not a big deal. With out a doubt getting more push out of my hemi and also having that great deep clean sounding mopar purr. Haven't noticed anything with gas really still in the range of 13 to 13.6 mpgs. Think it went down a point or two only because I keep hitting the gas to here it more. Very very happy with it so far.

great sound

Reviewed by michael w (Scottsdale, AZ) Reviewed for a 2006 Dodge Ram — Jun 30, 2012 5:07 PM

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1 of 1 people found the following review helpful.

sounds great , was easy to install but i have 20" spare tire i had to lose on my 06 dodge ram because of the way pipes ran at back of truck, other than that i love it

2006 Dodge Ram 1500 5.7L #817423 Stainless Steel Exhaust system

Reviewed by WILLIAM M (Pottstown, PA) Reviewed for a 2006 Dodge Ram — Jan 02, 2012 4:42 PM

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5 of 5 people found the following review helpful.

This exhaust system was simple to install, came packaged complete with everything necessary to make the job go easy with no troubles whatsoever. My 4" lift kit allowed me to remove the factory muffler/tailpipe in one complete piece, and made the entire job able to go from start to finish in less than 1 hour! The sound is excellent...just the right amount of rumble at idle...and on the throttle...you hear that distinctive sound! All in all, I rate this system A+ !!!

Great product! Awsome sound!

Reviewed by Jacob P (Burlington, IA) Reviewed for a 2008 Dodge Ram — Oct 06, 2011 8:27 PM

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5 of 5 people found the following review helpful.

This is a great exhaust system. It really does everything they say it will do. I installed it on my 08 dodge ram all by myself in the drive way in around 3 hours total. The hard part was taking off my old exhaust system. I had already had a shop make me an exhaust system and later I went back and installed a flowmaster muffler. The problem with that system is it wasn't mandrell bent and it was aluminized pipe. Just 3 years later my Chrome tip falls off and a lot of the bends were rusted through. So this time I spent a little extra and bought the stainless system, and am very happy with it. It is also backed by a life time warranty. You can't beat it for the quality and the price. Oh ya and that sweet sweet sound! Mpg boost is nice too.