help 99-00 SI CAT BACK on g2

my friend is sellin his APEX n catback exhaust system for $300

i was wondering if anyone has done this and tried other catbacks and slapped into our g2’s…

i mean its here at my house…i have a hole already on my right rear bumper bcuz i have a dual muffler setup…

just need feedback if anyone has done this before…will it bolt on and be long enough bcuz i have a 4door g2