High flow cats... yeah or nay? - Mustang Evolution

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Old 03-26-2017, 01:45 PM   #1
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High flow cats... yeah or nay?

I was getting some stink from one of my cats and it no longer smells but I can feel the exhaust rumble a little at wot and am wondering if one cat pooped the bed? If so, are magnaflow cats worth the coin?

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Old 03-26-2017, 03:16 PM   #2
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How many miles on the car, Cats have an 8/80,000 warranty since they are emissions.
Also if the car is under emissions warranty after market cats are against federal law and by law if the vehicle is sold you and the shop that put them on is liable for replacing them and paying the rather large fines
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Old 03-26-2017, 03:56 PM   #3
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38k miles. Good info, I have an xpipe welded in so Im guessing they would deny it?

Does it even sound like a bad cat to you guys?

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Old 03-26-2017, 04:06 PM   #4
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Is your check engine light on? Downstream o2 sensor should throw a code if the cat is bad. I seriously doubt it is bad at any rate they last a long time.
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Old 03-26-2017, 04:38 PM   #5
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Nope. Maybe my beast is just too beastly. Lol

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Old 03-27-2017, 11:57 AM   #6
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On my 90 GT when my cats went bad they rattled really loud at an idle, even had a bit of the honey comb material sticking out of the left exhaust pipe! I replaced them with Catco units and didn’t have a problem passing DEQ in Oregon. I was running a Kenny Bell 1.6 L blower, E303 cam, aftermarket heads etc. Of course I’m not sure yours would pass the emissions test or the visual, but in my case I didn’t have a problem.
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Old 03-27-2017, 12:08 PM   #7
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Magnaflow claims to be legal in most states. Im moving to nebraska in a few months, Ill have to look into it.

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Old 03-27-2017, 12:40 PM   #8
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I'm going to open a can of worms here, but this is an absolute fact.
There is no such thing as a high flow cat.
Any cat that will pass a smog inspection will flow no more than a stock cat.
And there it is, the cold hard truth.
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Old 03-27-2017, 02:01 PM   #9
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Thats what I was looking for... thanks.

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Old 04-08-2017, 01:31 PM   #10
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I have heard that so called "high flow cats" do have less restrictive air flow and are worth it on any performance based exhaust system. Have I seen any data or proof of these claims? no
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Old 04-08-2017, 02:18 PM   #11
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Quote:
Originally Posted by Renownedd View Post
I have heard that so called "high flow cats" do have less restrictive air flow and are worth it on any performance based exhaust system. Have I seen any data or proof of these claims? no
Same here. I was just thinking if my cats do crap out might as well try the magnaflows. That and Borla I actually trust.

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