IS F (2008-2014) Discussion topics related to the IS F model

Magnaflow vs gesi cats

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Old 10-23-17 | 09:20 AM
  #16  
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Originally Posted by clarionguy
Has the fuel smell disappeared for you?
In my respect with no cats it is impossible to drive with the windows down to not have your clothes smell.
After I put them on, at idle it is not noticeable but with decent or wot there is a chance I smell it. Seems like it depends on how the turbulence or wind is blowing.
Maybe 80% of the smell was elimanated by this cats, a lot better than without it.
Old 10-24-17 | 05:23 AM
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for clarification, are these cats $363 for just one cat? so like $726 for a set of 2?
Old 10-24-17 | 11:08 AM
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^^^^^Yep! They are pricey
Old 10-24-17 | 11:49 AM
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^ lol.. good thing I saw this. I almost placed an order for one. That would have been stupid.
Old 10-24-17 | 12:39 PM
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Originally Posted by Defratos
for clarification, are these cats $363 for just one cat? so like $726 for a set of 2?
Your right only 1 for $363. But interms of quality and function, for me its worth it.

Last edited by ljdsong; 10-24-17 at 12:50 PM.
Old 10-24-17 | 12:51 PM
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Originally Posted by ISF2NV
I read this interesting article few days ago when i was trying to find some stuff on gesi/vibrant cats. They also have a youtube channel
http://speed.academy/how-catalytic-converters-work/
This article convinced me to pursue this route since i have a supercharged kit.
Old 10-24-17 | 12:54 PM
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Originally Posted by ljdsong
This article convinced me to pursue this route since i have a supercharged kit.
Those are nice welds. Can you share the shop that did it for you? Also, who installed and headers and can you share what it cost?
Old 10-24-17 | 01:30 PM
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Originally Posted by jum3
Those are nice welds. Can you share the shop that did it for you? Also, who installed and headers and can you share what it cost?
kwik way mufflers installed those cats. Im the one installing the headers and my sc kit
Old 10-25-17 | 05:13 PM
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I just got my headers installed and can't stand the smell. I'll be buying magnaflow cats because my pocket isn't deep enough for gesi cats. I noticed some people installed the cat right before the o2 sensor, is this necessary if I have the o2 simulator from ppe installed? Or can I just install the cat after the o2 sensor without any CELs?
Old 10-25-17 | 05:32 PM
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Originally Posted by antnguyen
I just got my headers installed and can't stand the smell. I'll be buying magnaflow cats because my pocket isn't deep enough for gesi cats. I noticed some people installed the cat right before the o2 sensor, is this necessary if I have the o2 simulator from ppe installed? Or can I just install the cat after the o2 sensor without any CELs?
If you have the simulators installed it isn't necessary to have the after o2 sensors.

In my case I just did since the shop was convinced I could get away without simulators since I got these gesi. I never tried and left the simulators as is.
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Old 12-15-17 | 10:18 PM
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Originally Posted by MileHIFcar
I'm probably going to go with GESI even though they are more expensive. From the research I've done they lose less than 1% from what they claim with their proprietary metal stainless steel honeycomb structure.

Here is the cheapest I've found it so far: https://www.amazon.com/Vibrant-Perfo...ytic+converter

Here is the info from the site: http://vibrantperformance.com/catalo...oducts_id=2070
These are the correct units that we need in the F if going gesi cats?

V.
Old 12-15-17 | 11:50 PM
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^^^^^
Yes, the GESI #7525 cat is the correct one for the F per the last pic in post #12.

I have the same ones ready to be installed.

Last edited by tas02; 12-16-17 at 12:01 AM.
Old 04-25-18 | 12:12 PM
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Originally Posted by Max16
Magnaflow are ceramics cats. Good for a daily driver that doesn't get a lot of abuse. Ceramics don't hold well to abuse or heat cycles (splash of water for example).
Go with a metallic structure if you want peace of mind.
Magnaflow 29956 200cel high-flows are with a metallic structure (not ceramic) as low as $80 a piece (x2) on Amazon and eBay.
Vibrant Gesi 7525 lowest $337 a piece. (x2) on Tunersports.com

I don't think I can't justify that kind of money for Gesi ones. I am sure the power difference is negligible in comparison. PPE uses Magnaflows on their Dual system with documented gains.

Last edited by Rossi; 04-25-18 at 12:15 PM.
Old 04-25-18 | 12:34 PM
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Originally Posted by FilwithanF
Sorry I'm a bit late to the thread, but I i would not even bother with Magnaflow cats. I had them om my PPE dual mode and they rattled loose fairly quickly and almost lodged in my exhaust. I then bought GESI cats and put them through some very rigorous driving with no issues at all, thankfully. My advice, pay the money for quality and peace of mind. Otherwise, you'll probably end up paying twice lol.
I can tell the quality of this cats. There few instaces this cats hit those road bumps coz the car is lowered . Oh i remember that i hit one time that is so hard. I jack up the car check it. So far no issues. No regrets over the cheaper one.
Old 05-16-19 | 12:41 PM
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can anyone running either or give us any updates on any current issues with either cats i should consider...

im stuck between the Magnaflows from RR-racing or ordering the Gesi. car is only being a DD. It'll sting to spend the extra coin for the Gesi but I am looking for longevity. But if i can get the same from the Magnaflows for a third of the cost...

i read up in this thread the main thing is hard heat cycles is what kills the Magnaflows quicker and that's typically track driving, which i don't see myself doing in the near future.



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