Seriously, given the variance in collector lengths between models of the DC Integra, I would expect that you will need some degree of custom fabrication to mate up to the catalytic converter. Besides, I assume you're going to want a custom cat-back exhaust to accompany the new motor.

Since the motor you are retrofitting is dimensionally similar to a USDM B16A2, a 99-00 Civic Si header should clear the oilpan.

And lastly, please do not thread bump. We have a search engine feature that is just as fast and may even answer your question.