C63 AMG (W204) 2008 - 2015
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heads up 200cell flowmaster cats are junk

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Old Apr 26, 2020 | 10:40 AM
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heads up 200cell flowmaster cats are junk

I just spent 600 doing my custom mid section and welding in these cats before the rear o2 sensor in the same spot as the oem primaries and one of the cats already failed.

So pissed right now. It sounds like metal chunks bouncing inside it.

Car sounded amazing for about 2 days lol

Last edited by skratch77; Apr 26, 2020 at 10:46 AM.
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Old Apr 26, 2020 | 01:32 PM
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Bummer. Obviously doesn't help with labor cost but if you have the chance to swap, may consider some Magnaflows. Haven't put a ton of time on mine but, FWIW, replaced all 4 cats with 200 cell Magnaflow and sound/work great so far - I recall whatever 'legit' reviews I could find favoring them as one of the better/best 'affordable' hi-flow cat options. If you decide to use, would highly recommend getting from an authorized dealer - this seems to be an item that is heavily copied/cloned especially on ebay.
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Old Apr 26, 2020 | 04:12 PM
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+1 running Magnaflows for last 2 years no issues.As additional insurance, I ordered all O2s from FCP Euro
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Old Apr 26, 2020 | 05:32 PM
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Usually flowmaster is pretty good...I'm surprised.

They should send you a replacement for free anyways
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Old Apr 26, 2020 | 05:41 PM
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Originally Posted by Adi-Benz
Usually flowmaster is pretty good...I'm surprised.

They should send you a replacement for free anyways
I just read there reviews on Amazon and a bunch of people said the same thing.

I didnt even get 50 miles on one of them and you can see me in the video i posted on my guess my exhaust setup. That was me taking the car home from the shop and not even an hour later they broke.


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Old Apr 26, 2020 | 07:48 PM
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Magnaflow is the industry standard and industry supplier for 200 cell cats. Have a 3 inch 200 cell on my Audi and has been problem free for years.
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Old Apr 27, 2020 | 12:35 PM
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I had two on My C55, gone in a couple of weeks, junk!
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Old Apr 27, 2020 | 01:25 PM
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Are these ceramic flowmaster 200 CPSI, or metal substrate flowmaster 200 CPSI? (Cell Per Square Inch)
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Old Apr 27, 2020 | 01:49 PM
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Originally Posted by Vladds
Are these ceramic flowmaster 200 CPSI, or metal substrate flowmaster 200 CPSI? (Cell Per Square Inch)
Metallic
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Old Apr 28, 2020 | 09:17 AM
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I got these https://www.mbhmotorsports.com/produ...high-flow-cats from MBH and had them welded on my midpipes after my MBH headers end. Was able to pass emissions test here in Illinois with them and they're holding up after a year now.
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Old Apr 29, 2020 | 11:22 AM
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Go with Magnaflow, we sell magnaflow as 200cell, and G sport as 300cell , https://www.vrpspeed.com/product/hig...ic-converters/
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Old Apr 29, 2020 | 12:19 PM
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Originally Posted by VictoryRoadPerformance
Go with Magnaflow, we sell magnaflow as 200cell, and G sport as 300cell , https://www.vrpspeed.com/product/hig...ic-converters/
Amazon has them with 2 day free shipping at 101 each
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Old Apr 29, 2020 | 04:25 PM
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Originally Posted by skratch77
Amazon has them with 2 day free shipping at 101 each
lol
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Old Apr 30, 2020 | 12:37 PM
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I went with Kooks Performance 2.5” 300 cell race cats.



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Old Apr 30, 2020 | 02:08 PM
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psh...300 cell...do you even care about the environment at all.
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Old Apr 30, 2020 | 02:12 PM
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Originally Posted by hachiroku
psh...300 cell...do you even care about the environment at all.
Hahaha. I care enough to use 300 cell 😂😂
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