Size of Exhaust

djformi · **Posted:** Sun Dec 31, 2006 1:30 pm

Curious what the inlet and outlet size of the KJs exhaust is?

GPR65 · **Posted:** Sun Dec 31, 2006 1:55 pm

mandrel bent 2.5 inch pipe (plenty of flow)

Brigrat · **Joined:** Sun May 21, 2006 6:17 pm **Posts:** 92

that should mean that replacing the stock muffler with a better flowing model would be just as effective as doing the whole catback thing...right?

TheJawsOfDeath · **Joined:** Sun Nov 05, 2006 3:56 am **Posts:** 305

You could always go with a larger size exhaust pipe for the catback, like 3", but I dont think thered be much of a point to it since 2.5 is pretty big, though im no expert on flow requirements. I was planning on just having an exhaust shop weld in a glasspack, that would sound wicked.

uvalax236 · **Posted:** Sun Dec 31, 2006 3:26 pm

Its actually a 2.5" Outside Diameter Mandrel bent pipe. You could upgrade to a 2.5" Inside Diameter pipe and have a little better tone, but unless the shop is giving you one heck of a deal, I wouldent throw down the bills to do it.

Hood297 · **Posted:** Sun Dec 31, 2006 3:26 pm

i recently put on a flowmaster super 40, sounds pretty good, extra flow, and a lil extra economy.

i think the only difference with an entire cat-back system would be if your going to dual outlet. Other than that the piping on the liberty is pretty straight, and mandrel bend 2.5". I dont see a Cat-back being necessary, unless you want to do it yourself.

Jeepjeepster · **Posted:** Sun Dec 31, 2006 3:31 pm

Brigrat wrote:

that should mean that replacing the stock muffler with a better flowing model would be just as effective as doing the whole catback thing...right?

Correct.. Unless you want the tip to drop below the rear bumper and have a nice chrome tip. that wouldnt last a minute off-road though.

A muffler would be the best thing you could do. :wink:

Brigrat · **Joined:** Sun May 21, 2006 6:17 pm **Posts:** 92

Tips are nice and all, but I live in a rough climate, and a cromed tip would get trashed. I am really just looking for the beautiful sound, and perhaps a little performance. I had a flowmaster series 40, dual out on my Ranger (actually a B4000), and loved the sound, but the crome didn't do so well in the climate...

chetos · **Posted:** Sun Dec 31, 2006 6:23 pm

I am getting a Magnaflow on Tuesday. My muffler guy said that don't go chrome but stainless tip would be just fine...

elephantrider · **Posted:** Sun Dec 31, 2006 6:27 pm

hey hood297,

what did the flowmaster super 40 sound like on the liberty? did it have a loud drone in the cab?

did it sound good on the outside? i really want the flowmaster, but im afraid it would make the liberty sound like a rice burner with a big engine. not really looking for that!

Jeepjeepster · **Posted:** Sun Dec 31, 2006 7:03 pm

jasonk wrote:

hey hood297,

what did the flowmaster super 40 sound like on the liberty? did it have a loud drone in the cab?

did it sound good on the outside? i really want the flowmaster, but im afraid it would make the liberty sound like a rice burner with a big engine. not really looking for that!

Thats what Im worried about.. I dont want it to drone when going down the hw, but I want it to sound good.

I would really like to see a libby in person that has the the flowmaster on it..

raceinfan · **Posted:** Sun Dec 31, 2006 7:05 pm

someone here does have a sound clip of it but I can't remember who ???? maybe they'll pipe in

tjkj2002 · **Posted:** Sun Dec 31, 2006 10:28 pm

Quote:

Correct.. Unless you want the tip to drop below the rear bumper and have a nice chrome tip. that wouldnt last a minute off-road though.

A muffler would be the best thing you could do.

I have the Borla dual exhaust and have been through some really hairy trails and have only slightly knicked one of the tips,it's faired alot better than my rear hitch.When I get RL rear bumber I'll have the pipes bent up for looks.

TheJawsOfDeath · **Joined:** Sun Nov 05, 2006 3:56 am **Posts:** 305

Quote:

I have the Borla dual exhaust and have been through some really hairy trails and have only slightly knicked one of the tips,it's faired alot better than my rear hitch.When I get RL rear bumber I'll have the pipes bent up for looks.

How is that setup, true dual or single inlet dual outlet muffler? I think the 3.7 would sound really beefy with a good muffler, seeing as its based on a V8. Sound clips of any/all setups would be greatly appreciated if anyones got them, cause right now I'm trying to make the decision on whats going on my KJ.

Hood297 · **Posted:** Mon Jan 01, 2007 4:21 pm

in the 4x2 performance section someone has a clip of a flowmaster 50 series.

I love my super 40, at idle and up to about 1600RPM it sounds very much like a v8. Higher RPM's (3000-up) it sounds like it did when you rev'd it with a stock muffler but a little louder.

very little interior resonance also, at low RPMs you can hear a low rumble but the higher you get the less you hear it. keep in mind i also have some pretty loud mtr's.

in my opinion it sounds nothing like a rice rocket, nothing at all.

i can try and get sound clips but every sound clip ive heard hasnt given it justice.
If anyone is in the area id be glad to drive a while to meet you to hear it. or even over the telephone, not sure how it would sound but it'd give you an idea if you were in the market.

gone_jeepin · **Posted:** Mon Jan 01, 2007 9:15 pm

I was thinking about maybe putting a Cherry Bomb muffler on the KJ, any opinions on whether it is or is not a good idea or what you think it would sound like???

TheJawsOfDeath · **Joined:** Sun Nov 05, 2006 3:56 am **Posts:** 305

I second that question. A cherry bomb is just a specific kind of glasspack right? I was thinking of replacing my muffler with one also. I had a pair on my dakota w/the 5.2 V8 which sounded amazing. A friend of mine has one on his car which has a DOHC 2.5V6, and it also sounds very nice. Im sure it would sound good on a KJ but yeah sound clips please. I checked the 2wd forum and couldnt find that post with the clips.

Hood297 · **Posted:** Tue Jan 02, 2007 1:57 pm

http://choicetoolsupply.com/kj/flowmast ... ter_50.mov

here's one of a flowmaster 50 series...

Size of Exhaust

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