Currently have a Yoshi RS5 and thinking of replacing it with an Arrow. Being under the rear seat it is more work than i've had to do before with side mounted cans which are normally just a couple of bolts. Do I have to take the rear plastics off or can it be done without doing that? Clearly as i'm asking this i'm pretty useless with bike DIY so any instructions would be very much appreciated! Also anyone know if the Yoshi cans use the original pipe so the Arrow will be a straight replacement?