i can't even begin to give you a price, but i was 800-cans ,500-stainless piping, 500-600 labor, -chop subframe, move all electronics to side and front of bike, plus we bought a jardine system for the headers etc etc etc.
i was going to do my bike like that at first but i thuoght those can's were too expensive then i saw the arata can , but the arata does,nt flow enough air so from my trial and errors i copied the 999r full 62mm exhaust concept, but i put two custom cans on the end because we can't find one big can with dual inlets and exits, i think their sexy but everybody's got an opinion -freedom of speech-.
you can fit one pipe behind the swing arm but the other will be on the side of the swingarm , unless you go with smaller diameter piping ,thorsten did it and it seems to work for him. i think one big pipe works great and less hassle with fitment.
we have'nt dynoed yet, but it has crispy response and on the track he did'nt loose hp anywhere he was just as fast as i was on the straights and coming out of corners etc.