450cc injectors are good for about 260-275whp. The drag kit will support more power than your stock block can handle, so don't worry about that. AEM EMS, what a stupid idea, period, for any application. First find out who is going to tune your car, and see what they reccomend. The S300b MIGHT be a good option after another year or two, but it is foolish to be the first group of persons to guinea pig a new system.

typically, I prefer to build a kit from other used kits. Like pick up a used drag kit, and then replace what you want to upgrade. If you are new to turbo/modding cars then I would suggest buying a full kit that will allow you to upgrade as you grow more knowledgable.

So, the first thing you should do is find a local reputable tuner, and see what he reccomends.

-PHiZ