would a smaller diameter pipe from the turbo to intercooler be to much of a restriction? say 2" or 2 1/4"? assuming the turbo would have a 2" outlet.

BUMP... This was less than helpful and even included some misinformation. Lets not argue about which setup is better or worse. Lets just all agree it may not be as efficient as a front kit but, it is far cheaper than a standard engine bay install and you could get similar results. Besides, for a platform that charges $400 for intakes and MAYBE 15 hp, what's so wrong with $2-3k for 150+hp?? Anyone have any real world experience and have some tips/advice for those of us considering this avenue? Plus, the original question was about oil less turbo, besides not having to mount an oil pump, lines etc, is it worth using one?