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Resolved High flow cat will pass?


Proven Member
Aug 18, 2014
Hamden, Connecticut
I have obx high flow cat, I brought it for my 420a but sold it and never install it. I was thinking to cut the flange and weld 3" flange for my gst thermal exhaust. Before I do that, do you think this high flow cat will pass emission? I mean there nothing inside. :idontknow:
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Last edited:


Proven Member
Sep 12, 2013
tampa, Florida
Yea if that was a cat, you wouldn't really be able to see the other side due to all the "filtering" media inside of it. Autozone can get universal high flow cats from magna flow I believe


Proven Member
Apr 26, 2014
Aurora, Ohio
I seen dsm's pass without a cat if the are burning clean not proven just told that


10+ Year Contributor
Apr 14, 2012
bergen county, New_Jersey
Had the same thing in my car passed emission via obd hook u and visiual inspection but didn't try it on turbo. That one passes visual because theirs a 02 bung connected to it rather than just a pipe
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