Posted for "Berni Breen" <bbreen@fortherecord.com>:

 I recently purchased (from Lancair) and installed the IO550 Air
 Induction kit on my normally aspirated Lancair IV.  Upon testing after
 installation, I was quite surprised to see only a very modest
 improvement in manifold pressure when opening the air induction, no
 matter what altitude I tried.  I had previously flown in a Legacy with
 the same engine (IO550G) and saw considerably more performance
 improvement.  In the Legacy, flying at 210 kts IAS, I saw a 2.0" MP
 increase at 7,500' or above.  In my IV I see only a .6" (or less)
 increase regardless of altitude.  Additionally, at altitude, I saw a 10
 knot increase in speed in the Legacy and nearly zero in my IV.
 
 Am I the victim of unrealistic expectations or am I missing something?
 If so, why the difference in the Legacy and the IV?  I would appreciate
 any and all suggestions.
 
 Berni P Breen