The factory supplied air box was too large.  I cut it down to fit a NAPA Gold #6140 air filter.  Jabiru says the 2200 needs 550 pounds of air per hour which is 114 cubic feet per minute (CFM) at sea level.  The 6140 is rated at 320 CFM.  You can see my airbox before and after modification (outlet tube was attached later, see third pix).  The Bing carburetor will not develop full RPM if the airflow into it is turbulent.  You can see my air flow straightener and where it is attached to the carburetor and airbox.  The hot air from the exhaust muff is attached to a tee going into the airbox and also the cabin heat vent on the fire wall.  The airbox has a sheet metal backplate, that I added, and is mounted on standoffs to clear the vertical firewall stiffener.  AIRBOX PIX

The engine overall installation shows the fuel system: gascolator, boost pump and filter (40 micron NAPA). I used two 6 volt batteries in series so they would fit on the firewall shelf.  The Jabiru 2200 is light enough to mount the batts here, in fact, with full fuel, two people and 30 pounds of baggage the CG is just in front of the aft limit. These sealed lead acid batteries are fine for warm weather but do not have enough cold temperature cranking amps.  ENGINE PIX

The cowl is home made using Jabiru nose bowl halves and .016 6061 T6 aluminum.  The top and bottom cowl pieces are joined with piano hinges.  There are two openings in the bottom of the cowl one for air flowing through the oil cooler and the traditional opening just in front of the firewall.  I seem to have no heating issues as the CHT's (I have probes on all four cylinders and a dual meter with switches) run about 250 F in cruise and 300 F for climbs.  Oil temp max is about 180 F.  Air inlet can be seen on last picture.
COWL PIX