That is what I found :
1. 2.5 inch diameter twice give as much as 39% increase over 3inch diameter OEM piping !
2. Ribled piping lost is incredible compared to standard straight piping, can't remember the numbers, but big lost removed for sure
3. The Dual cone filters I used (2 filters) give 3 time more filtration area than a single Apexi "Power Intake"
4. Removing 180degree of restriction, then 120 degree and 3-4 feet of piping plus the 2 bolt restrictions are all huge restrictions
5. The T divider where the air is slitted to each turbo is a HUGE loss because of the generated turbulence when both turbo work
I wanted one on my car also but I'm going Single now so It will be a loss of money...