Headers on a B serie motor

I'm installing my DC Sport headers (4-1) on my B serie motor and i was wondering if i have to modified my cross member on my civic 91

is your civic 4 cylinders? make that dc sports HEADER

is your civic 4 cylinders? make that dc sports HEADER
Yea my car is a 4 cyl

He's saying it's header not headers.

i have a DC 4-2-1 header on my b16 and no modification was needed. i also have a megan 4-1 header on my b20 block and i needed to make a pretty big notch in the crossmember.