Alright, I'd like to create an end-all guideline for exhaust layouts/choices in USDM (and maybe others) 96-00 Civic "EK" hatchback with B-Series motor swaps. With heavy Google searching and research for my own car, I can share this small amount of information and would appreciate others chiming in.

1. My car runs a Tanabe Medalion Touring exhaust (https://www.redline360.com/tanabe-me...tchback-T70018) which is listed for a "1996-2000 Civic Hatchback (EK)" but it is truly only considering a USDM Civic with a D16Y7 header/cat combo. In order for it to fit with my SMSP replica header, the exhaust's b-pipe was modified to accept a 2.5" "JDM style" collector (https://www.jhpusa.com/store/pc/view...idcategory=381) and shortened a bit.
   
2. In order for it to be a 'bolt on' situation, I would have had to run a B16A2/99-00 Civic Si header with a stock-ish collector size (2.25" or 60mm) and it would not have allowed me to run a catalytic converter. The exhaust will bolt directly to the header with this configuration. In order to run a catalytic converter, you will need to modify the b-pipe to accept a "3-bolt" flange. Example:
   
   
   

Now, I am not familiar with every single exhaust setup under the sun. There was speculation that certain Japanese companies making EK9/B-Series EK's specific exhaust would allow you to bolt everything on but with a shortened catalytic converter. Can anyone confirm this? Is there such a thing as a bolt-on exhaust for B-Series swapped EK Civics with Civic Si headers and OEM cats? It is also worthwhile asking what everyone else used when they used Integra GSR/ITR headers too.