An article in a local Mag years ago had a story on a guy who did his PHD on intake design and injector placement. I cant give numbers but on the same length intake runners - long fiberglass cones, he dyno'ed 3 positions, the most HP was with the injector close as possible to the head, but the most torque was with the furthest placed injector, the middle funnily enough was a mix of the 2, from memory the furthest out was around 14 inches, the gains were more than dyno variance - double digits on a 4.0L straight 6 @280hp