[Talesin]

Yes, you need a MAF-T. You also need an upper intercooler pipe set up for blowthrough mode if you are intending to use the MAF-T setup to atmospheric vent your BOV (can't just put the GM MAS where the stock MAS sits, have to have the GM MAS *after* the BOV), and not just compensate for how easy it is to overrun the stock 1G Karmann MAS.