Flat out - Direct port systems are the most reliable, safest and most accurate nitrous setup available. the closer to the ports you get the less chance of puddling and seperation. Why do you think car manufacturers went away from throttle body injection? Multiport injection is more accurate, precise and efficent. The same follows through for nitrous injection. Seriously - how many sub 10 second EFI nitrous drag cars run anything but multiport setups?

95 Contour, Custom EVO bodykit, 2.0l, PNP Focus head, Stage 2 cams, Je pistons, Eagle rods, 4in1header, 2.5" header back exhaust(complete stainless), D P nitrous, ram air intake, 10mm wires, flamethrower.