I have a 27 hp kholer and was wondering where could i get dual exhaust from and if a mikuni carb kit would work for my motor? i am trying to up the motor a bit because it can not push a load at all. thanks

Only exhaust readily available is the BPS Q. Unless EVT still has some, there is no mikuni kit for them either right now. You do not want a 42 mm carb. If you try to do it, you want the 33mm with the accelerator pump. IMO, heads and exhaust first (also get a velocity stack and k&n for the stock carb)...then cam...then pistons/rods...then carb. If you want to do much more that 2 or 3 of those options, save all your money and put it towards a bigger block.