Hi there Steve.
Personally I think I would use more polygons and try and get a more indepth mesh around that area if being honest - but nothing to stop you building the intake seperately then chopping out that intake and welding in a new one with greater mesh density!
What I sometime do if want rounded edges however, is to chop a cylinder or tube in half, scale it, rotate and weld for england!
so, say the pink bit is your wing/top of intake...

then create a tube, chop it half, delete any unwanted (inside polygons) and rotate...

use snap lock to put the pivot on the vertex corner, then snap the decapitated tube to the wing and scale until the bottom of the tube is roughly in line with the lower section of the wing - you can then snap the tubes lower vertices in place to exactly match up with the lower wing section ones (remember to also delete any inside polys from the wing as well)...

then use drag-snap on the verties on the tube to line them up with the wing vertices, and use extrude (on edge) to open out new lengths...

Attach one to other and grab the welder...

you might want then to rotate the corner vertices to keep it looking smoother...
Like so much with 3DS/GMax there are probably a couple of ways getting around the problem that you have here, and they are all correct, as long as they work!... Hope helps
Good luck and all the best
Mike