sportex 4" on my 1.1

  1. #1
    will i have to cut the rear bumper out straight away or can i get away without doing this until im sure i like the exhaust?
  2. #2
    also will i have to change anything else about the rubbers i use or will the ones i take off the standard backbox be alright? unless they break i no but will they be fine to reach down to the bottom of the bumper