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Old 03-28-2013, 08:21 PM   #1
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I was wondering what would happen if I cut my catalytic converter off? I was thinking if I could do that and add flowmasters. Or would it be better to keep my catalytic converter and add flowmasters. What are the pros and cons? And would it sound louder without the cat?

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Old 03-28-2013, 08:23 PM   #2
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It would be louder without the cat. . . .I dont know too much about this but i think you should leave it on. . . engines need some sort of back pressure.

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Old 03-28-2013, 08:25 PM   #3
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I cut them off on my f150 and it seemed like it ran better to me but I'm new to jeeps and I was jw
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Old 03-28-2013, 08:28 PM   #4
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I wonder if anyone on here has cut theirs off
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Old 03-28-2013, 08:28 PM   #5
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Originally Posted by Bigchris66 View Post
I was wondering what would happen if I cut my catalytic converter off? I was thinking if I could do that and add flowmasters. Or would it be better to keep my catalytic converter and add flowmasters. What are the pros and cons? And would it sound louder without the cat?
It is against federal law to not have a CAT.
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Old 03-28-2013, 08:28 PM   #6
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I was wondering what would happen if I cut my catalytic converter off? I was thinking if I could do that and add flowmasters. Or would it be better to keep my catalytic converter and add flowmasters. What are the pros and cons? And would it sound louder without the cat?
Don't know what state your in but it may be needed for emission testing, and it is illegal.
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Old 03-28-2013, 08:33 PM   #7
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Here in nj you need the to pass emission testing so I cut mine right after and ran a turn down.. After I pass inspection I am cutting off the cat as well.. Will not hurt your engine. It will also give you a little more power
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Old 03-28-2013, 08:34 PM   #8
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I live in south Alabama they don't check I cut my cats off on my f150 but I was wondering what's the pros and cons on doing it on my jeep
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Old 03-28-2013, 08:39 PM   #9
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Pros are:

power
In theory better gas mileage
No harm to engine

Cons are:

It's a louder ride
It smells a little funky


I would recommend for a nice sound and good power cutting at cat and adding a 16in cherry bomb to a turndown.. Sounds great and isn't too obnoxious
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Old 03-28-2013, 08:41 PM   #10
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Do y'all think a flowmaster 40 series sound good I like loud and aggressive
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Old 03-28-2013, 08:42 PM   #11
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There mild the flow master super 40 is a little better but your best bet is a cherry bomb glass pack.. If you get a 16in it will fit in stock spot where muffler goes. That my friend sound great
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Old 03-28-2013, 08:44 PM   #12
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How much is it and how loud will it make it
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Old 03-28-2013, 08:45 PM   #13
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It's the sound you want I don't know exact DB's but they run 50-70$
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Old 03-28-2013, 08:49 PM   #14
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If I buy them offline I wonder if my muffler shop will put them on but thanks for the help man
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Old 03-28-2013, 08:50 PM   #15
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Why do you want all the noise, do you want to warn the girlfriend/wife your almost home?
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Old 03-28-2013, 08:50 PM   #16
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Just because your state doesn't check for them doesn't change the fact that by law your vehicle must have all factory emissions equipment. And if you have a tj it has sensors and your engine will run like shit from it thinking it need more o2. My wife's car has 2 and it doesn't even run properly with a non oem cat.
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Old 03-28-2013, 08:53 PM   #17
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As stated its illegal to remove it via federal law.

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