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Discussion Starter · #1 ·
ok, thinkin' about something to give the jeep a better sound and open'er up. I want to replace my stock cat with a hi-flow one. I was lookin at www.metalcat.com.au/ what do ya'll think? any others I look at, if you have suggestions please let me know.
 

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Im sure everyone around here is pro active environment tree hugger but i cut the cats off mine and welded in a staight pipe, and made a custom exit out the rear. With a flowmaster super 40 the power gain is extremely noticable and sounds like a v-8 when i power down on it. Just another option. Some jeeps have an O2 sensor behind the cat and removing the cat will actually cause your check engine light to come on, but all 4 o2 sensors on mine are at the precats after the manifold. Ide check that out before considering a setup like mine. But if your gung ho on the cat they make some nice hi flow aftermarket i hear.
 

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i bought a magnaflow universal hi flow cat off ebay for like $50 shipped. actually i don't know if it was that much. i just had it welded on when i had my flowmaster welded on. just my $0.02.
 

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hi flow cat sounds good but i wouldn't count on it giving you a very different sound. the muffler will be what gives it a different sound
 

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Be sure to check to make sure what ever cat you get is approved. And to remove it is a major violation of Federal law.
 

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flowmaster 40 series muffler.
 

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Discussion Starter · #8 ·
I have a header back system with the flowmaster 40 series muffler. the only problem is that its the stock cat.
 

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I have one of those high-flo cat.... didn't notice any real difference when i put it on... Waste of money just like every other bolt on engine mod (at least for the 4.0L)
 

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i have a banks header magnaflow cat and magnaflow catback and i noticed a difference in sound and power but all and all i still a 4 rats for a motor
 

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if the cat is still working to take it off is even against the law

and it wont pass inspection w/out a cat
Sadly enough, there are a lot of places in the country that don't have yearl inspections or emissions testing. So people can run vehicles however they want, but I donno what its like in his area.

And I feel bad for anyone that has yearly vehicle inspections, sorry :D
 

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Yeah. like the people in Cali, don't even THINK about exhaust mods or they'll throw you in prison! I let THAT state for a reason.

The back-pressure you get from the cats increases torque, if you open it too much it becomes detrimental. But headers hi-flow cats, and a nice muffler should increase power.

As far as flowmasters; they are a chambered muffler and I don't about Jeeps, but in my Cobra I blew them out. Not a big fan anymore. I ended up w/ magnaflow.
 

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Discussion Starter · #13 ·
so what hi flow cat should I get
 

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you can get the magnaflows for 20 on 4wd.com
 

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As far as flowmasters; they are a chambered muffler and I don't about Jeeps, but in my Cobra I blew them out. Not a big fan anymore. I ended up w/ magnaflow.
what do you mean blow them out? i noticed mine sounds like i have no muffler now a days. (flowmaster 40)
 

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there are various jeep catalytic converter that you can choose from.. it would merely depend on your choice and the budget you wanna spend.. there is borla, magnaflow, flowmaster, etc.. anyways, I had a magnaflow installed on one of my ride - works great and no prob with it.. good luck just get the one which you think good for your car. :)
 

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Sadly enough, there are a lot of places in the country that don't have yearl inspections or emissions testing. So people can run vehicles however they want, but I donno what its like in his area.

And I feel bad for anyone that has yearly vehicle inspections, sorry :D
Mudweiser its ok , no inspections in Florida.
but Foxinthemud must see He's local codes.
 

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No inspections in Michigan either. My cat is gone and I have a Magnaflow. It sounds good and I deff. noticed a little more kick to it. I did a side exit before the rear tires too, keeps it away from gettin hit by my rear axle at full flex.
 

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Mudweiser its ok , no inspections in Florida.
but Foxinthemud must see He's local codes.
Man, 30 years ago I used to have to go to the inspection station with my dad to get our cars checked lights brakes exaust everyything. How things have changed.
 
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