Downpipe with Cat Break-in
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Joined: 11-20-06
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From: Charleston, SC
Downpipe with Cat Break-in
Regarding proper downpipe and catalytic converter break-ins, I just purchased a CIA Header/DP combo in the Group Purchase and chose to go with a hi-flow cat. After seeing threads go back and forth about how to break them in, what the process and the duration should be, etc. I asked Dan from Clear Image Automotive himself and hear is his response:
Originally Posted by ClearImageAuto Dan
The converter cores we use are a metallic substrate and very free-flowing. In all the years we have been using them we have probably assembled and shipped roughly 1200 converters. Of those, we have had roughly 30 fail. In almost every circumstance the converters failed in pairs. This was due to improper air/fuel ratio caused by either a faulty O2 sensor or improper tuning. The mixture was either too ruich, plugged the converter and blew the substrate out or the mixture was too lean, burned/melted the substrate and literally burned through the center and caused the core to disentegrate. Technically speaking there is no "break-in" period for a catalytic converter as there are no moving parts. As long as the air/fiel mixture is correct a cat converter should never fail.
I hope this answers your question.
Feel free to post it for others.
I hope this answers your question.
Feel free to post it for others.
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Joined: 05-05-08
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From: Stroudsburg, PA
I didn't intentionally break mine in. When I first put it on it sounded kinda "loose?'(sorry if that doesn't make sense) now after 2 weeks my air flow is a lot "tighter" Idk lol but I think it broke in
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Senior Member
Joined: 11-20-06
Posts: 537
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From: Charleston, SC
I took Dan's response to indicate that there really is not a "break-in" required for downpipes with cat's since no parts are moving or settling really inside. Since failure was almost always seen as a result of excessive lean or rich conditions or faulty O2 sensors in dan's case, failure is not because of some break-in or lack there of.
Now my question is, is the stage 2 tune excessively rich
haha.
Now my question is, is the stage 2 tune excessively rich
haha.
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