Things you will need to convert an E16s equipped car to run an E15T:
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E15T Engine. ( the whole thing. )
GA16DE ECU
GA16DE Harness
GA16DE MAF
GA16DE TPS
GA16DE HVC and Power transistor
GA16DE Throttle body
GA16DE Fuel pump relay and connector
4 Fuel injector Plugs ( see image )
A'pexi S-AFC-II ( S-AFC-I would work i suppose )
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Bits 'n Pieces:
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replacement fuel hose
replacement vacuum lines ( silicone is nice but what about lines with fuel vapor that silicone hoses don't like??? )
replacement cabin heater hoses / radiator hoses / turbo cooling lines.
replacement turbo pipes if you're feeling spendy.
bosch fuel injector plugs
some weather pack connectors 1,2,3 and 4 pin types ( maybe a count of how many later... ) did a count, it's on page 2 or 3
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Things you might want:
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3 wire ( heated ) o2 sensor ( helpful with SACF for tweaking )
Nismo Euro Cam

intercooler ( i haven't looked yet to see which ones are commonly used )
Pro-Street, 12 circuit fuse block
lets you loose that silly fuse box under the dash and re wire things in a sane manner.