the left was pretty easy, used a long screwdriver and a masonery drill bit (a long black spur cheapo from pount shop) then knocked it out it come out clean, the right hand side had was harder, it involved drilling the rivets at the bottom end of the cab, pull the internals out, you are then left with the part with the cats in and a long baffle pipe, i had to cut the baffle pipe, then gouge out the cat, then re-weld the baffle pipe in place then re-rivet it back, the back pressure now is immense compared to how it was, no restrictions now, and a power commander on the way... happy days..

it looks like the yam akro's are around �650 to �700 and the akros that are not from yamaha (the ones without cats) are �1100 euro's so its cheaper to get the yam ones and rip out the cats..it can be done

Edited to add i reckon you could get away with doing the left one, as most of the gases would flow through the left side as there is no restrictions, i was going to only do one but thought i had time so would do two..