It is looking a lot better.

The 90 degree angles wil assist that slowing of air speed. I also agree with TimBle in a 1-3 ratio not being ideal for air cooled systems. Unfortunately the design of a small inlet, small outlet systems requires more design capability than the average modeler has available. I use a small in, small out cooling systems but a lot of design math and composite design went into them. As with anything else there is a down side. When the plane stops moving the inlet/outlet air stops with it, requiring a secondary means of generating airflow. Not something the average modeler would want to tackle.

For most modeling puoposes the 1-3 ratio, combined with a little planning, works good enough.