[Adventure boy]

Im trying to get the twin exit look on my 420 coupe I have been told that the M2401 back box has the same width exit pipes as the 440 which is what I have the rear valance from
is this correct ? can that back box fit, I have a custom exhaust guy who can fit it and make the pipe needed but if they are wider or narrower then its back the the drawing board !! I was also thinking about a back box delete ? anyone done it is it mega loud

THanks guys any advice on this would be really helpfull Ive not heard a 420 with a back box delete actually driving only sat revving !!
CHeers
Rob