une bonne solution serait d'adapter une boite a air 1.5 à 2 fois plus grosse que celle d'origine (S2000, gros TDI, etc...).

=> plus de volume tampon comme une ARC chamber et moins de perte de charge avec un filtre beaucoup plus grand!...... si en plus elle prends l'air comme la JR je pense cela serait une des meilleures config

The question, though, was where exactly this pressure loss was occurring. To determine this, pressure readings were taken at several points along the intake system, as follows:

In the bottom of the airbox (after the intake snorkel, but before the filter)
In the top of the airbox (after the filter)
At the inlet to the airflow meter (after the outlet duct/bend of the airbox)
At the outlet of the airflow meter (the start of the long duct across the engine bay)
The pressure loss found at those points was as follows (cm H2O):

Pick-up Snorkel: 8cm (19%)
Air filter element: 3cm (7%)
Top of airbox: 14cm (33%)
Airflow Meter: 12cm (29%)
Duct to Throttle Body: 5cm (12%)

This quickly points out some interesting facts: Firstly, the popular drop-in, reusable type of filter is clearly going to have almost no effect, gaining at best a maximum of 3cm pressure improvement. (Note that the filter tested was already quite old and dirty - and yet 97 per cent of the restriction was not from the filter!) Secondly, the duct across the engine bay, despite its length, flowed quite well. The tuned length of this part, and the existing resonator box, were regarded as desirable to keep.