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Unread 05-21-2013, 06:49 PM   #1
zakary0811
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Wj Exhaust mods

What muffler should I put on my Jeep, I have been thinking about thrush glasspack because I like the sound of glasspacks. I just want yall's opinion on what I should get. It has the 4.0 I6 in it. Less than $100.

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Unread 05-21-2013, 07:36 PM   #2
Elite
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I've ran a magnaflow and also a flowmaster super 44 which I ended up putting a cutout(basically a Y pipe) before the muffler and now I run a straight pipe with the cutout still intact. It's raw and throaty and still could be louder in my book. Each ran me around $80. With all the cats these WJ's have you really don't have to worry too much about being too loud.
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Unread 05-21-2013, 09:10 PM   #3
brianestep
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Quote:
Originally Posted by Elite View Post
I've ran a magnaflow and also a flowmaster super 44 which I ended up putting a cutout(basically a Y pipe) before the muffler and now I run a straight pipe with the cutout still intact. It's raw and throaty and still could be louder in my book. Each ran me around $80. With all the cats these WJ's have you really don't have to worry too much about being too loud.
Only if you have a California emissions WJ. You probably do. The OP probably doesn't. But yea Magnaflow Cat and Flowmaster muffler are a real popular combination. The famous KOLAK exhaust. 2.5" pipe all the way back. Basically the same advantages of airflow as a glasspack, without the JNCO jeans and Faygo.
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Unread 05-21-2013, 09:15 PM   #4
pinky2252s
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Quote:
Originally Posted by brianestep View Post
Only if you have a California emissions WJ. You probably do. The OP probably doesn't. But yea Magnaflow Cat and Flowmaster muffler are a real popular combination. The famous KOLAK exhaust. 2.5" pipe all the way back. Basically the same advantages of airflow as a glasspack, without the JNCO jeans and Faygo.
California emissions doesnt mean that the car was just built for California use, it means that it will pass emissions in CA. I would wager that at least more than half of the WJ's have the 3 cats. Except for the 04's

But yeah Im running no muffler on the 3 cat set up and it isnt too loud. I mean, its LOUD but not louder than any other truck with glass packs.
Im thinking about putting a glasspack on mine..


Quote:
Originally Posted by brianestep View Post
Basically the same advantages of airflow as a glasspack, without the JNCO jeans and Faygo.

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Unread 05-22-2013, 07:14 AM   #5
brianestep
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Quote:
Originally Posted by pinky2252s View Post
California emissions doesnt mean that the car was just built for California use, it means that it will pass emissions in CA. I would wager that at least more than half of the WJ's have the 3 cats. Except for the 04's
Yea yea, I'm just saying... The 3 cats are for Cali emissions. Are they strictly found in California? No.. But I would wager that the concentrational parameters of Cali emission WJs are nearer to California than not. Although I bet we have a bunch here in CO too with the great immigration of failed (and successful) dot-commers in the early 2000's.
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Unread 05-22-2013, 07:30 AM   #6
aestrad1
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Running the Kolak set up on the V8 and its great. Not too loud, but nice and deep. Its more than $100, but its worth it
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Unread 05-22-2013, 10:21 AM   #7
tehgregzor
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DO NOT put glasspacks on the 4.0. With it being an inline motor, the exhaust flow is constant instead of pulsed like a V setup, so the fiberglass is always vibrating, amkes it sound SUPER ricey. I tried it with a thrush and hated it. If you don't believe me, look it up on youtube. I really like my magnaflow if noise or drone is a concern, it has NONE. If you want louder, keep your cats and straight pipe. The inline 6 sounds pretty good naturally.
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Unread 05-22-2013, 12:24 PM   #8
ZB_WJ
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Quote:
Originally Posted by tehgregzor
DO NOT put glasspacks on the 4.0. With it being an inline motor, the exhaust flow is constant instead of pulsed like a V setup, so the fiberglass is always vibrating, amkes it sound SUPER ricey. I tried it with a thrush and hated it. If you don't believe me, look it up on youtube. I really like my magnaflow if noise or drone is a concern, it has NONE. If you want louder, keep your cats and straight pipe. The inline 6 sounds pretty good naturally.
I heard a thrush turbo on a 4.0 and thought it sounded pretty good for $45. But I wasn't in it and I didn't hear it driving. But on startup and idle it sounded pretty mean.
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Unread 05-22-2013, 12:25 PM   #9
ZB_WJ
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Quote:
Originally Posted by brianestep
without the JNCO jeans and Faygo.
I don't even think they make JNCO anymore
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Unread 05-22-2013, 01:21 PM   #10
tehgregzor
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yeah startup sounds mean, cause of the low idle, which means reduced exhaust output. Once you give it consistent throttle, sound quality greatly decreases from truck vroom to honda brruunnnn
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Unread 05-22-2013, 03:25 PM   #11
Jeeples
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Quote:
Originally Posted by brianestep View Post
The famous KOLAK exhaust. 2.5" pipe all the way back.
3" pipe makes the panties drop
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Unread 05-22-2013, 05:59 PM   #12
zakary0811
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So i should do like a 3 inch pipe from the cat.
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Unread 05-22-2013, 06:35 PM   #13
ssands85
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I wouldn't go that big on a 4.0, unless your stroked or pushing a few lbs of boost with a turbo.... 3" is gonna be a bit too big to keep the exhaust pulse speed up when your not doing 6k RPM.

Last edited by ssands85; 05-22-2013 at 06:36 PM.. Reason: spelling
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Unread 05-23-2013, 05:33 PM   #14
zakary0811
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I just want something louder than stock, but not anything that will cost a lot. I like glass packs because they are cheap and if one breaks you can go get another one, without it costing a fortune to fix.
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Unread 05-23-2013, 10:52 PM   #15
Elite
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You should go for a glass pack then. Nothing wrong with them. But also, just like I said earlier, all my exhaust mods where under $100 installed which you said you wanted. Nothing was wrong with any of mine, just kept getting the itch to try new bigger and louder things.
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