#1. Boring is when they make the cylinders larger. They go the minimum amount to make the cylinder true (same diameter at the top and at the bottom) This will require a new set of pistons because the hole is larger in diameter, so you need a larger piston. Most shops prefer to do a bore job after they port a pair of cylinders. That way the bore is 100% fresh and true.
#2. Porting is when they smooth the ports in the cylinders. It allows air to flow better. They also opean up the ports in the sleeves. That changes when the fresh fuel and air come in and when the exhaust goes out. It is like putting a performance camshaft in a 4 stroke engine. It is highly recomended that if you dont know what your doing to have some one do it for you. You can ruin a good set of cylinders pretty fast.
#3 Port matching the top case half to the cylinders is when they opean up the side of the case a little bit so it is an even flow of fuel and air from the crank case up in to the transfer ports. (ports on the sides of the cylinders)
#4 You can get a pair of cylinders already ported and they will go on your banshee's engine fine. I would highly recomend sending them to some one and have them checked out first. That way if they need bored they can do it. Other wise you risk having a bad running engine due to low compression, or worse yet destroying the cylinders, and crank because the piston skirt broke. When the cylinders get worn they become to large for the pistons. They pistons can rock back and fourth in the cylinder and that is what brakes the bottom of the pistons off.
#5 You could also buy a pair of non ported cylinders and send them to a builder. That way you dont have to tear your banshee down and wait. Brandon at Wild Card probably has a pretty quick trun around time. So it wouldnt be any big deal to send him the whole engine. That way all the engine assembly would be done. Other places my take longer to do the work. The more popular the builder the longer the wait.
josh