Flowmaster Mufflers/Exhaust
- Thread starter JSTJPN
- Start date
jeeeep
Hooked
if you like loud and don't mind drone, the flowmaster is your muffler.
I ran flowmaster on my GC 5.7 hemi and it did make a difference in it's get up and go with little drone, but the GC is more sound insulated than a jk. with the windows down on the GC the flowmaster was noticeable.
I also ran flowmaster on my CJ's but I was much younger and loud didn't bother me then :doh:
BDSJEEP
New member
I have quite a bit of experience with Flowmaster. Their Flowmaster® Part #: 817674 sounds completely awesome on these Pentastars! (in my opinion). Listen for yourself...but to answer your question about performance, well...I would recommend buying an exhaust that is pleasant to your ear. If you're buying to look for performance increase, you most likely will be disappointed no matter WHAT you buy. Increases (if any) are very negligible. Instead, buy it because it sounds good!
This kit completely tucks under the Jeep and exits out the back. Additionally, you wont blow exhaust all over yourself on those dusty trails like the down-piped kits that exit before the axle!
This series (American Thunder) has pretty aggressive outside volumes. But no more than the Dynamax setup that guys around here are running. You can get this same kit with an additional resonator called the Force II.
I also run the 44 series Flowmaster cat-back kit w/resonators (Force II) on my Supercharged 2012 Challenger
..here's an install vid of how easy this thing is...
Last edited:
Mike Chapman
New member
I added a Flowmaster kit...
I have the Flowmaster American Thunder Exhaust Kit on my 2008 JKU.
It does get loud... I does Drone.. It did add a little Performance.. And I think most aftermarket mufflers will...
I didn't get it for performance though, I wanted to relocate my muffler and install an Air-Tank (Viair 2.5gal) in its location. For this reason alone I would recommend this type of swap. I'm also not going to show it off until I make some sort of Armor for it (while it doesn't hang as low as the muffler did it still just LOOKS vulnerable)... but that'll be another thread..
I have the Flowmaster American Thunder Exhaust Kit on my 2008 JKU.
It does get loud... I does Drone.. It did add a little Performance.. And I think most aftermarket mufflers will...
I didn't get it for performance though, I wanted to relocate my muffler and install an Air-Tank (Viair 2.5gal) in its location. For this reason alone I would recommend this type of swap. I'm also not going to show it off until I make some sort of Armor for it (while it doesn't hang as low as the muffler did it still just LOOKS vulnerable)... but that'll be another thread..
JSTJPN
New member
Good idea on using the space from the old oem muffler for on board air location.
Linebacker
Caught the Bug
I have a flowmaster on my MJ and like it a bunch. The tone is great and makes the 4.0 sound strong. I don't think you're gonna get a noticeable horsepower increase with any aftermarket muffler. To get a small increase you'll need a can the size of a '57 Caddy along with an intake change. Surprisingly the stock goodies do a very good job. Jeep spent lots of time and money on the dyno to maximize HP and not give you a headache on a road trip.:twocents:
JSTJPN
New member
Which muffler did you use?
Suprchrgd_rubi
New member
I am thinking of going with the dynomax cat back system with tail pipe, anybody use this system yet?
Static83
New member
I had a flowmaster 50 series installed custom at a local shop. Doesn't have the drone of the old dynomax Evo that I had before. That drove me crazy. Here's a vid I took a couple months ago, it's gotten a bit deeper since. http://youtu.be/YQw4nGbqB2g
Sent from my iPad using Tapatalk
Sent from my iPad using Tapatalk
JSTJPN
New member
Sounds good. I like the fact that even with a soft top you are not being drowned out with noise.
JSTJPN
New member
I have been between the super 44 and the 40. Have you heard what the 40 sounds like on the 3.8?
DynoMax Exhaust
Member
radleyhardy
New member
I got a Flowmaster Delta40 for free.99 off an old buddy's project. Can't beat free, but I'm going to swap in a Dynomax and tuck it up towards the tub
Suprchrgd_rubi
New member
I'm thinking of 39523 I want something not really loud or drone but needs to flow since I will be adding edelbrock supercharger, and want ground clearance in the rear area
JSTJPN
New member
So you like the dynomax sound over the flowmaster?
