More power will at some point necessitate more fuel that is easy to provide with upgraded port injectors. With direct injection, however, things may become much more expensive and involved and difficult to source and sign off before they make it to the market.
Edit: it is not out of the question making intake manifolds that would house port injectors to work in conjunction with the factory direct injectors to avoid excessive cost while adding some, possibly acceptable and justified, complexity
Last edited by s62; 06-08-2013 at 12:25 PM.
Reason: Adding a tangential thought