Jeep WJ 4.0L Flowmaster FX Exhaust

[@kirkl6900]

Hell yeah more 4.0s need the flow fx. I put one on a xj a year ago now thats the only muffler to use for them. The straight tube muffler case style is better sounding

[@tub4148]

How does it sound. At highway speeds. Just bought one for mine

[@maniacalmonster2293]

am I in another world? since when does a 4.0 have the O2 sensor down there on the pipe? Thats 4.7 isnt it?

[@tinsink21]

Non CA emissions 4.0s had it down there. The CA compliant ones did not.

[@mrno3525]

Y lil back pressure? I deleted my muffer n just have a St8 pipe.

[@freddyflazh]

It sounds very awesome. My question is does it add any type off performance gain??

[@browndogproductions2103]

Minor improvement, maybe 1 MPG. A little bit more throttle responsiveness.

[@levitezoe1804]

It definitely adds 10 HP HAPPY PERSON . The formula is it makes you as happy as 10 people

[@jeepindave5683]

Sounds mean man

[@zachsheffee8458]

Don’t worry, shr don’t bite.

[@Memorymode]

How does it sound on the highway?

[@browndogproductions2103]

There is a little drone. The Flow master 44 sounds a tad deeper, seems to drone a little less than this muffler.

[@microtechmachineshop]

did the cat change the sound at all

[@browndogproductions2103]

I would say no, but I did both at the same time.

[@socastee_5.097]

What size tires ?

[@browndogproductions2103]

245/70/16. Essentially 29.5". I recently went to 31s, Michelin LTX 2s. Highly recommend for daily driving. As well does well for minor off road.

[@dethecs]

PSA to people thinking about buying this setup: I drilled about 15 5/16" holes into the bottom of my stock muffler and it has a nearly identical sound to this setup. Haven't noticed any loss of performance or any downsides so far. I Was thinking about a muffler delete, but I didn't want the drone noise or obnoxious sound levels, so I compromised, and im pretty happy with it. So, if a better sound is all you're looking for, I'd recommend at least grabbing a drill bit and punching some holes to see if you like it or not. If you don't, then buy a exhaust setup, but you can save a ton of money messing around with the stock exhaust yourself.

[@jeremyabsher5971]

Staring from where ? Right behind the cat and the whole way to the rear ?

[@clarkoceans8239]

Yeah I’m curious where you started from too

[@skoparweaver7692]

Yea no that's not going to sound the same...

[@browndogproductions2103]

Not so sure about that friend.

[@lightsout176]

Won’t sound the same from afar tho. But if you like mechanics cracking jokes about you…

[@Amarillobymorning777]

It’s all in your imagination I’m pretty sure

[@graystone3048]

No check engine light? You need to turn in your Jeep card! Lol

[@browndogproductions2103]

Lol, this WJ has been a champ. Even all my electrics work too! Who would have thought.

[@zachsheffee8458]

I am a troll and live under a yellow cement bridge.

[@timjd7964]

Back pressure problems?

[@browndogproductions2103]

Nope