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Subject: "Hi-Flow Cat Turns Lo-Flow" Previous topic | Next topic
ModeratorCorbinNov-07-15 08:32 AM
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#138648, "Hi-Flow Cat Turns Lo-Flow"


          

I've noticed a weird metallic rattle at idle. I thought it was just the exhaust or a heat shield. It got noticeably louder and I stuck my head under the car to see where it was coming from. It was coming from the catalytic converter area, but when I put my foot on the cat to stabilize it the sound continued. I also found tiny white flecks coming out of the exhaust. Removing the cat today, I see that my 3" hi-flow cat is not living up to its name:



The rear section of the honeycomb broke free and turned sideways. It almost completely blocks the outlet. I bet the car is going to run a lot better with a new cat.

Corbin
'97 GSX dressed like a '95 ESi

  

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AdministratorCODE4Nov-07-15 08:49 AM
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#138649, "RE: Hi-Flow Cat Turns Lo-Flow"
In response to Reply # 0




          

Was it a name brand cat or an eBay special? Mileage/age of the cat? I know you have emissions of n your area, but maybe a drop in test pipe for the other 364 days of the year is in order

---

2012 2500HD LML


  

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JNov-07-15 04:36 PM
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#138650, "RE: Hi-Flow Cat Turns Lo-Flow"
In response to Reply # 1


          

+1 on a test pipe, no question about it!

  

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ezNov-08-15 02:27 PM
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#138651, "RE: Hi-Flow Cat Turns Lo-Flow"
In response to Reply # 2


          

That's a new one! Sounds like a drop in performance wasn't what you noticed initially, that's crazy because it's almost entirely blocked.

2gnt: '99 RS-T, killed by a toyota, pending rebuild...
Daily: Volt
Daily #2: '99 EVG ebike- STOLEN by PEDRO

  

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ModeratorCorbinNov-08-15 02:33 PM
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#138652, "RE: Hi-Flow Cat Turns Lo-Flow"
In response to Reply # 2


          

It was a Magnaflow cat that I've had about 8 years. I've had good luck with that brand with mufflers, but I am disappointed with the cat failure. It might have seen a little more vibration than a stock vehicle, but not abuse. I bought the identical part number again and will hope to get at least 8 years out of it. I do need to pass emissions. I am also a closet greenie.

Corbin
'97 GSX dressed like a '95 ESi

  

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