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there shouldn't be anything between the headers and the cat ?
My headers were 2.5" flange.
i installed JDM B18C SIR-G (AUDM VTIR equivalent) into EG GL
and the only modification that was required to the exhaust
is the rotation of the flange.
Because the bolt position of the cat
and that of the JDM headers are aligned slightly
different, you will need to cut either end off
and reweld it so the bolt holes are parallel.
To show you what i mean. This is the end of the stock header...(vtir)
http://img31.imageshack.us/img31/2560/image145k.jpg
Im not using the stock eg or integra exhaust at all...its some custom crappy job one (ill get pics later) so yea...gonna need the flange with the springy bolts that goes on the pic above.
I only seem to find bigger flanges and had no luck at all from wreckers and even exhaust shops.