P.S. I forgot to mention these are mainly for NA set-ups, FI obviously has forced air anyway and have to take into account far higher cfm's. With the TFSI it needed to have ultimate flow - i.e. orifice dimensions needed to be wide enough to flow x (i.e. 30lbs/min 600+cfm for example) (the width of the runners in laymans terms and ultimate flow) but the down side is loss of low end torque due to a slower gas speed. Whereas the VR/R32 ones have long runners as they were for NA, undersquare torque monsters, so needed quicker air up top so needed a way to speed up air there - these are the two m