Cat Bypass Pipe Pt #? '90 90q 20v

[David Thoresen]

When I had my Ur-Q it had a bypass cat pipe and only a center
muffler.... it sounded excellent!  I want the same setup for my 20v...
does anyone have a pt# for the pipe?  Also would you recommend just
putting a straight pipe in the back and putting in a straight through
resonator in the center or put in a straight pipe in place of the
resonator and put a high flow muffler in the back...?

Thanks!
David
'90 90q 20v