It seems that the flange going from the downpipe to the cat converter in my car doesn't fit. When you guys do the B18C1 Swap into the civic, do you use the civics downpipe or the Integras? My concern is the civic downpipe works but there is no where for the primary O2 sensor. Thanks.
For some reason there were certain years of GSR that shortened the downpipe and moved the primary O2 bung to the front of the converter. Makes no sense to me but I suspect that's what you are a victim of. I accidentally bought a DC GSR header before and didn't realize it was too short and bungless.
An aftermarket header with the proper length (they make them all generic length to fit most models) and O2 bung is probably the solution, even if it's just a small diameter collector Ebay special. I assume you are keeping your stock cat/location at this time?
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