Also I'm wondering from where you/ITG receive the intake air which is not an easy task on the 4/4. The standard intake/airbox is located just behind the radiator, the intake hole is directed to the downside. I guess that some cold air comes up from underneath the radiator when she is driving..which is a positive behave.
But the issue is that when you drive faster than 60 mp/h the air flow becomes weaker. Another issue is, that this construction only works ok if the environmental air temperature is less than ca.12 degrees celsius.
Perhaps you catch the air from above the radiator through the grill?
