I currently have 4 headers @ home anyhow, i'm trying to fit usdm itr header onto civic si catalyic converter and i notice that flange angle is different. for long period of time, i tought ls/gs/si cat would bolt right on-to itr header or other way around. or my eyes are retarded.

please tell me if flange angle on itr header is different than other headers out there.

thanks h-t

 

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