hey guys so i recently bought a replica tri-y header for my 2000 acura integra gsr. It has a 2 1/2" collector. I also purchased a magnaflow catback exhaust to find out its 2 1/4" piping. I was wondering if the header will still bolt up to my stock catalytic converter? or will i have to get a 2 1/2 catalytic converter and modify the catback to fit up to it? or should i just modify my stock cat by putting a 2 1/2" flange on the header side so everything bolts up? or like i first asked, will my stock catalytic converter bolt up to a 2 1/2" collector off the header?

sorry if this sounds confusing, im just stuck on this situation

 

if it is for your car specifivally it will work.

be sure it is for a gsr.