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Old 05-22-2013, 11:51 PM   #1
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Glasspack

I'm going to get my glasspack installed tomorrow(the only thing I haven't done myself to my Jeep) and I wanna know if I can keep the stock muffler on there and just get the glasspack in front of it. A guy at Autozone said I can do it and it'll be deep like how I want it. Can I do this? And the guy said it would be around $35 to $40 to install, is that accurate?

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Old 05-23-2013, 12:31 AM   #2
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It will sound bone stock if you do. If you want a rumbly sound ...the stock muffler needs to be removed.

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Old 05-23-2013, 12:33 AM   #3
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And a $30 Thrush Welded sounds way better than a glasspack. Muffler shops usually charge about $20 per weld.
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Old 05-23-2013, 01:18 AM   #4
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The factory muffler is attached to the back of the cat and there isn't enough room after the muffler either therefore the factory muffler will need to be removed. No offense but IMO Glasspacks sound like crap especially on a 4 or 6 cylinder engine. It will sound raspy and obnoxious. Look into a chambered or turbo muffler if you want it loader.
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Old 05-23-2013, 05:02 AM   #5
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And you would want two mufflers.........why? (besides the fact they would not fit) It would make it quierter and add more restriction
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Old 05-23-2013, 10:35 AM   #6
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Ok I have a new question. If I got straight turn downs(the kind where the tip is where the muffler used to be) would I asphyxiate from all the exhaust when I'm at a red light or would it be fine?
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Old 05-23-2013, 10:41 AM   #7
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Ok I have a new question. If I got straight turn downs(the kind where the tip is where the muffler used to be) would I asphyxiate from all the exhaust when I'm at a red light or would it be fine?
I had it turned down exactly where your talking about and I loved it no fumes. Now I have just the muffler and no tailpipe so the exhaust is comming out right under the jeep... I haven't died yet. But I do wanna add the turn down pipe I just haven't had any time
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Old 05-23-2013, 10:48 AM   #8
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Ok I have a new question. If I got straight turn downs(the kind where the tip is where the muffler used to be) would I asphyxiate from all the exhaust when I'm at a red light or would it be fine?
If you wheel in dry dirt or spend alot of time on dirt roads a turndown can kick up more dust. Also depending on the muffler you might hear a drone at certain RPMs.
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Old 05-23-2013, 10:51 AM   #9
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If you wheel in dry dirt or spend alot of time on dirt roads a turndown can kick up more dust. Also depending on the muffler you might hear a drone at certain RPMs.
Well I'm talking about no muffler and probably just the cat. Would there still be a drone?
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Old 05-23-2013, 11:03 AM   #10
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Well I'm talking about no muffler and probably just the cat. Would there still be a drone?
I drove that way for about a week, sounded good at idle, then at higher RPM's it got pretty annoying, welded in a 20 inch glasspack, sounds good.
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Old 05-23-2013, 11:09 AM   #11
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this is it..
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Old 05-23-2013, 11:12 AM   #12
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this is it..
Yeah see I have a 25" thrush glasspack and from videos I've seen it just sounds like a Honda and I don't want it to sound like that. Does a 20" sound good?
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Old 05-23-2013, 11:31 AM   #13
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Ok I have a new question. If I got straight turn downs(the kind where the tip is where the muffler used to be) would I asphyxiate from all the exhaust when I'm at a red light or would it be fine?
What is it you are really trying to do (and how old are you?)

- Realistically no muffler is going to sound like crap. (yea if you are in your teens you might think it is bad ass but a loud TJ with no HP..........)

- Yes a turn down under the vehicle can be dangerous. Carbon Monoxide will get in through holes and gaps in floorboards and open windows. It is oderless.

- Check your local inspection requirements. I know here in NJ when they did do tailpipe emisssions, the pipe did have to exit from under the vehicle (most states have gone away from tailpipe checks for OBDII equipped cars)
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Old 05-23-2013, 11:48 AM   #14
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No muffler = Get yourself and your passengers, as well as your neighbors, some good earplugs.
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Old 05-23-2013, 11:55 AM   #15
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Yeah see I have a 25" thrush glasspack and from videos I've seen it just sounds like a Honda and I don't want it to sound like that. Does a 20" sound good?
It is a V6. Your not going to make a V6 sound like a V8. I guess it all depends on what you think sounds good. I haven't ever heard a V6, that I though had a good sound. To each his own.
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Old 05-23-2013, 12:22 PM   #16
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It is a V6. Your not going to make a V6 sound like a V8. I guess it all depends on what you think sounds good. I haven't ever heard a V6, that I though had a good sound. To each his own.
Fail!!! Unless its an aftermarket engine he DOESN'T have a V6, it's an I6...

I hope you know your Rubicon DOESN'T have a V6 in it either.
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Old 05-23-2013, 02:02 PM   #17
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It is a V6. Your not going to make a V6 sound like a V8. I guess it all depends on what you think sounds good. I haven't ever heard a V6, that I though had a good sound. To each his own.
I think you meant I6 but your right, you'll never get any 6 cylinder to sound like a V8. Not only is the displacement typically smaller but the engines firing order has alot to do with it as well.
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Old 05-23-2013, 02:10 PM   #18
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Unless I missed it the OP hasn't mentioned his goal?? Do you need a new cat back and your trying to save some money by installing just a glasspack with no tailpipe? Or are you trying to make the Jeep louder?
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Old 05-23-2013, 02:15 PM   #19
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The longer your pack/muffler the quieter it will be. a glass pack is gona be loud no matter what. My buddy runs a hushpower muffler and it sounds good. Deep, but not loud. Just a bit louder than stock.
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Old 05-23-2013, 02:21 PM   #20
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What is it you are really trying to do (and how old are you?)

- Realistically no muffler is going to sound like crap. (yea if you are in your teens you might think it is bad ass but a loud TJ with no HP..........)

- Yes a turn down under the vehicle can be dangerous. Carbon Monoxide will get in through holes and gaps in floorboards and open windows. It is oderless.

- Check your local inspection requirements. I know here in NJ when they did do tailpipe emisssions, the pipe did have to exit from under the vehicle (most states have gone away from tailpipe checks for OBDII equipped cars)
Since I got my Jeep, it hasn't had a tailpipe at all. I had no problems with fumes getting in. I don't know if carbon monoxide specifically is odorless, I will not argue with that. However, exhaust most definitely has an odor. My father's van leaked exhaust through the floor, and that is with a full exhaust system, and yes, you could smell it. We drove the van like this for 4+ hour trips, and the worst that ever happened was a headache. Point being, I didn't smell any exhaust leaking in my Jeep, but I also had a hardtop on, and the 6" lift + 35" tires gave plenty of room for exhaust to escape.

I think OP will be fine with a turndown. I put a 15 degree turndown on my muffler recently to keep exhaust directed away from the body, and I like it. It also made it a little bit quieter, which I like since the Flowmaster on it makes a lot of road noise.
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Old 05-23-2013, 03:11 PM   #21
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Since I got my Jeep, it hasn't had a tailpipe at all. I had no problems with fumes getting in. I don't know if carbon monoxide specifically is odorless, I will not argue with that. However, exhaust most definitely has an odor. My father's van leaked exhaust through the floor, and that is with a full exhaust system, and yes, you could smell it. We drove the van like this for 4+ hour trips, and the worst that ever happened was a headache. Point being, I didn't smell any exhaust leaking in my Jeep, but I also had a hardtop on, and the 6" lift + 35" tires gave plenty of room for exhaust to escape.

I think OP will be fine with a turndown. I put a 15 degree turndown on my muffler recently to keep exhaust directed away from the body, and I like it. It also made it a little bit quieter, which I like since the Flowmaster on it makes a lot of road noise.
OK I'm not intentionally trying do derail this thread however I have to ask why you and your father would put yourselves at risk for Carbon Monoxide poisoning by continuing to drive a vehicle with an exhaust leak on 4+ hour trips?? Think about what you just said "the worst that would ever happen is a headache" .. At the point of a headache you are already at the "mild acute poisoning stage". Hopefully you fixed the leak..
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Old 05-23-2013, 03:30 PM   #22
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OK I'm not intentionally trying do derail this thread however I have to ask why you and your father would put yourselves at risk for Carbon Monoxide poisoning by continuing to drive a vehicle with an exhaust leak on 4+ hour trips?? Think about what you just said "the worst that would ever happen is a headache" .. At the point of a headache you are already at the "mild acute poisoning stage". Hopefully you fixed the leak..
Well he doesnt have that van anymore, but the body was completely rusted so there was no fixing it. But hey, you gotta get from point A to point B and your options are limited. I would be more concerned about people who smoke cigarettes everyday.
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Old 05-23-2013, 03:41 PM   #23
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Well he doesnt have that van anymore, but the body was completely rusted so there was no fixing it. But hey, you gotta get from point A to point B and your options are limited. I would be more concerned about people who smoke cigarettes everyday.
I detest cigarette smoke with a passion, NO ONE will EVER smoke in my house or any of my vehicles, PERIOD. That being said, one cigarette will not kill you, one trip in that van absolutely had the potential to kill you. Just sayin...
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Old 05-23-2013, 03:51 PM   #24
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I detest cigarette smoke with a passion, NO ONE will EVER smoke in my house or any of my vehicles, PERIOD. That being said, one cigarette will not kill you, one trip in that van absolutely had the potential to kill you. Just sayin...
Ah, but I am still here and 400,000 people a year are not here due to smoking.
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Old 05-23-2013, 04:04 PM   #25
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Ah, but I am still here and 400,000 people a year are not here due to smoking.
smokers average a pack a day... every hour they smoke a cigarette, and eventually, over the course of a number of years, after thousands upon thousands of times "rolling the dice", 40,000 of them die per year.

During that same one year period, 500 people die of CO poisoning, usually after "rolling the dice" a single time, and most of the time without ever having even been aware there was a choice...
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Old 05-23-2013, 05:08 PM   #26
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I had it turned down exactly where your talking about and I loved it no fumes. Now I have just the muffler and no tailpipe so the exhaust is comming out right under the jeep... I haven't died yet. But I do wanna add the turn down pipe I just haven't had any time
i got the same thing lol
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Old 05-23-2013, 06:09 PM   #27
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Well I'm talking about no muffler and probably just the cat. Would there still be a drone?
i dont know what your goal is bud but no muffler on a I6 will sound like some honda with a fart can haha if you want a good sound i would go with a flowmaster super 44 series muffler i picked mine up for $50 and i like the sound its really deep at idle and to crazy loud on the highway
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Old 05-24-2013, 11:44 AM   #28
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Fail!!! Unless its an aftermarket engine he DOESN'T have a V6, it's an I6...

I hope you know your Rubicon DOESN'T have a V6 in it either.
Yes I know I have a Straight six. Please excuse the typing error, but does it really matter? Your not going to make either sound good.
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Old 05-24-2013, 11:56 AM   #29
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Yes I know I have a Straight six. Please excuse the typing error, but does it really matter? Your not going to make either sound good.
No it doesn't really matter, but a straight six and a V6 is a huge difference in engine styles.
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Old 05-24-2013, 12:04 PM   #30
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No it doesn't really matter, but a straight six and a V6 is a huge difference in engine styles.

True. But he wasn't talking engine styles. He was talking about the sound.

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