that slot maf adapter you got to fit the maf to the intake pipe, where the hell did you get it from? link?
Intake pipe was custom made by Jagy together with slot to maf adapter and at the end of the intake pipe is big velocity stack which fit JWT POP charger... I can send you Jagy´s email address, if you want that kind of pipe, PM me...
As Spook said - We´ve managed to get working OEM Almera GTI MAF sensor in that intake pipe...
To Sam: yes of course, I can measure it, no problem... But I think it clear the brake booster - some guy on PGA is running Xcessive plenum even together with N1 runners, which are longer...