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Old March 30th, 2013, 01:16 AM   #1
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Hi flo cat question


Hey everybody whats up. I want to install some high flo cats, but I don't know if I should get metallic or ceramic. I do eventually want to go FI, but I'm not sure if I really need metallic ones.
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Old March 30th, 2013, 02:17 AM   #2
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Metallic, they will perform better than ceramic.

I have metallic high-flow cats and I am F/I.
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Old March 30th, 2013, 12:06 PM   #3
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What brand of high-flow cats do you guys recomend ?
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Old March 30th, 2013, 12:19 PM   #4
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Not a fan of high-flow cat's. I've seen more high flow cats fail than not. From the cheap brands to the "premium".

If inspection is required, I would recommend getting them with a mid-pipe at the least. However, if you eventually want long tube headers I would wait and buy the catted-midpipe that matches the headers you want.
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Old March 30th, 2013, 02:01 PM   #5
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The only problem I have with not running cats is these engines are obnoxiously loud without them. I have longtubes, catted mid pipe and Corsa mufflers. I wonder what it would sound like without the cats.
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Old March 30th, 2013, 02:08 PM   #6
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With my TVS installed ill have 610whp. Everyone ive talked to said to stay on factory cats or go catless. Hi-flo have a habit of failing. Id hate to lose an engine over my cats.
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Old March 30th, 2013, 02:14 PM   #7
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Anybody on here went catless with a 2nd set of small mufflers somewhere in the system? I have a lot of raw fuel ripping through there due to the cams and I'd hate to have problems from a damn cat failure.
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Old March 30th, 2013, 06:03 PM   #8
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so high flow cats fail all the time, both ceramic and metallic? They give symptoms if they are failing though, right?
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Old March 30th, 2013, 06:54 PM   #9
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I've personally never heard of them failing. I added a Magnaflow x-pipe with high flow cats to my old 04 GT and my current 06 GT. It made both my Magnaflows and Corsas a lot louder, no issues at all.
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Old March 30th, 2013, 06:54 PM   #10
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They don't always fail. I have been running metallic cats for quite some time and so have a lot of people, doesn't mean they cant. They are definitely more durable than ceramic.
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Old March 30th, 2013, 07:38 PM   #11
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When you did your cats did you guys get a smell, all I can remember is after my dad had to put cats on his fox body it smelled pretty bad
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Old March 30th, 2013, 07:51 PM   #12
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I know I've seen cats fail on regular daily driven low power shit cars. They clog, heat up and rob flow and power big time. I figure with stage 2 cams and all the unburned fuel running through the exhaust I'd be prime for failure/clogging or some shit like that.

I'm considering a 2nd set of mini race mufflers somewhere behind the mid pipe and pulling the catted mid pipe. I'm sure that would call for a trip to JPC's dyno for a re-tune though.
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Old March 30th, 2013, 08:22 PM   #13
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Well the only time you hear anything about high-flows is when they fail. How many folks are going to start a thread about how his cats are doing fine. The only real issue you have to worry about is clogging and that is something that happens over time, usually not all at once. You should be able to feel your exhaust getting restrictive before it should become an issue. Though I've never run cats for an extended period of time on a modded car, it has never been up there on my things to worry about.

I put some cats on just a few months ago and was going to swap out the mid pipe once I passed emmisions but I've been lazy and not a priority because it's not my DD. Now it's almost the point of no return and closer to my next inspection than it's been since my last one. Anyways they were just a set of cheap Pypes ones and welded them in.
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Old March 30th, 2013, 09:14 PM   #14
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Originally Posted by Anthony05GT View Post
Anybody on here went catless with a 2nd set of small mufflers somewhere in the system? I have a lot of raw fuel ripping through there due to the cams and I'd hate to have problems from a damn cat failure.
That's my thoughts exactly I went with the off road h takes the chance of that out if the mix.
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Old March 30th, 2013, 10:10 PM   #15
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Originally Posted by faym 08 View Post
That's my thoughts exactly I went with the off road h takes the chance of that out if the mix.
How loud is your car?

Post a vid if you got one!
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Old March 30th, 2013, 10:27 PM   #16
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I imagine it will be loud my kooks are being jet coated as we speak. I will post a video in my thread once we install.
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Old March 30th, 2013, 10:49 PM   #17
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Sounds good. My car is already loud with my ARH and high flow h-pipe.
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Old March 30th, 2013, 10:55 PM   #18
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Originally Posted by BlackWidowStang View Post
Sounds good. My car is already loud with my ARH and high flow h-pipe.
Are you Catless as well?
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Old March 30th, 2013, 11:58 PM   #19
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Originally Posted by faym 08 View Post
Are you Catless as well?
Nope, high flow metallic cats for me.
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Old March 31st, 2013, 01:15 AM   #20
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Theoretically if your emissions is only checking the OBD2 and not doing a visual/sniff you can run catless without a real problem with the right tune?
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