For an electric motor to make any boost it would have to be rather large and even then only very low boost would be produced. The motor would be so large that it would consume more power than the extra power created by adding this small amount of boost. It would also be expensive and time consuming to install and definatly not worth the effort. Why not add boost properly using a blower or turbo set up that are proven to produce reliable power and if you shop around and do most of the work yourself can work out quite cheap.
