Injector size?

When I get my KB 2.1 twin screw will I need to get bigger injectors with 6 lbs of boost or be safe and get bigger ones? I figure if so I would do it at the same time so when I get the KB chip with the blower I can have it programmed for the same size injectors. Also how much HP can the stock MAF handle before it pegs?

Thanks one and all!

I cant find anything about injectors on the site and have spent a week trying to call them but I think I have a better chance of calling George W.