if u mean 2 different preferences, depends on what u going for la... if u going for outlook, do up bodykits first lo... if u looking for performance, go for exhaust...
if u wanna do up both but dunno which one come first, do as i suggested previously.... coz i also wanted to change to new muffler adi, but also wanted to add rear lips.... wants to make both of them looks nice and save some hassle going back and forth the bodykit shop....