Intakes without boxes vs. Intakes with boxes

The intake temperature is one of the most important factors in making power.  

Hot temps have a snowball effect on turbocharged vehicles.  

• When the temp increases the air becomes less dense so the car will make less power by default.  
• Hot temps heat soak the intercooler and make it less efficient.
• Hot temps cause the car to become more knock prone.
• Hot temps cause the car to reduce ignition timing via the Intake Air Temp Igntion Timing Compensation Table.  This is the main reason the cars feel slow and sluggish when it's hot outside.  This table is also one of the main reasons most people run less than optimal 1/4 mile times.  Heat soaking in the staging lanes causes the IAT to increase and the car is missing 4-8 degrees of timing the whole 1/4 mile.
• Without a box around the intake, the MAF sensor is prone to being disturbed by the airflow from the radiator fans.  This will cause fueling inconsistencies when the radiator fans kick on and off, which will in turn cause idle fluctuations.  These inconsistencies are from the airflow variances caused by the fans along with the fueling corrections that are incorrect due to not having a box.  The tip in and tip out fueling corrections are based on speed density which takes into account the air density and air temperature, so when the intake temps are drastically different than the ambient temp, these corrections are thrown off which will increase the corrections and rpm fluctuations.
• If the disturbance from the radiator fans makes the car run lean it can also make the car misfire, especially during cold starts when the 02 sensor and fueling corrections aren't active yet.