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Unread 08-11-2013, 05:43 PM   #1
Mattias25
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1991 YJ Wrangler 
 
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Location: Jackson, Michigan
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muffler

so i have 2.5 and i dont plan to remove it lol but i have big plans for this thing, well until i finish my degree in diesel engineering and put in my 4bt. now im looking for muffler to give me very nice sound from this thing, i am considering getting a new cat or removing it

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Unread 08-11-2013, 07:58 PM   #2
superj
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1987 YJ Wrangler 
 
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What is required in your area for emissions? Cats are usually 100% required
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Unread 08-11-2013, 09:27 PM   #3
GrantYJ
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Quote:
Originally Posted by Mattias25 View Post
so i have 2.5 and i dont plan to remove it lol but i have big plans for this thing, well until i finish my degree in diesel engineering and put in my 4bt. now im looking for muffler to give me very nice sound from this thing, i am considering getting a new cat or removing it
While what superj says is absolutely correct, there are still a few places that they just don't care (I live in one of them). That being said, I've still got a cat under mine, but it's been hollow since 2000. I'd still recommend getting a high performance cat in lieu of cutting it off.

For the muffler, it all depends on what your definition of a "nice sounding" muffler is. For the little 2.5s I prefer just a plain jane old turbo, but I never had much luck with longevity under my YJ, so after number 2 or 3, I put on a Magnaflow. It definitely flows better, but it's awfully loud. More than one person has asked me if it was a diesel. On the bright side though, it's been on there for over a decade. I've had pipe break, but the muffler is still going strong.
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Unread 08-11-2013, 09:34 PM   #4
Mattias25
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I'm looking at magnaflow cat, I want to find nice flowing one. And might get flowmaster 40 or super 44

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Unread 08-12-2013, 04:55 AM   #5
superj
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i have never had the 2.5 so i cannot help on the sound of different exhaust systems
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Unread 08-12-2013, 08:35 AM   #6
Mattias25
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It's all good man lol any ideas on a good cat?

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Unread 08-12-2013, 08:49 AM   #7
zte87
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IMO flow master sound like poo poo on the 2.5, I run a cat and 14 inch magnaflow on mine oh yeah and and a 12 inch glass pack/resonator!
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Unread 08-12-2013, 09:11 AM   #8
Mattias25
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What magnaflow and what glasspack?

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Unread 08-12-2013, 09:24 AM   #9
Mattias25
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How did you get it to fit?

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Unread 08-12-2013, 10:32 AM   #10
dancytron
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Quote:
Originally Posted by GrantYJ View Post
While what superj says is absolutely correct, there are still a few places that they just don't care (I live in one of them). That being said, I've still got a cat under mine, but it's been hollow since 2000. I'd still recommend getting a high performance cat in lieu of cutting it off.

*some stuff deleted*
You don't live in one of them. You will flunk the Missouri safety inspection without a cat. You should also flunk for no EGR valve, no evap canister or hollowed out cat. Of course, since the safety inspections are done by private stations, what they actually check varies wildly. You just got lucky.
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