Just did a build similar to this but drag ported. I was like u and wanted to spend under 2500. Well that went right out the window to set my bike up properly. If I remember right it's a 1000 bucks just to buy cylinders, and add 300$ to each cylinder for porting. Then you got crank like 500 have to get cases trenched, new pistons, clutch, basket lockout, override ext ext the list goes on. As fast as the bike will be when it's done the,THE MONEY GOES FASTER