[hardk0re]

Since your looking at the first gem's.. Pickup "high performance ford focus builders handbook", it may explain some things for you. The IMRC is by no means a throttle body it changes the length of the intake runners for different resonances to achieve better power. Unless your forced induction a real short intake runner will not net you more power...this topic is in fact covered in this book along with some dyno results to back this up.

regardless of anything your going to need total custom tuning if you start messing with throttle bodies per cylinder, or custom intake manifold.

There is no 5th injector...... unless your redneck tuning your car...